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Stock-Based Compensation Plans - Restricted Stock Units (Details) (USD $)
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12 Months Ended |
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Sep. 30, 2012
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Feb. 03, 2012
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Sep. 30, 2011
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Cash Settled [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number |
31,735 |
44,429 |
19,000 |
| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price |
$ 18.10 |
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$ 57.45 |
| Weighted-average exercise price of shares reserved for issuance under non-option equity instrument agreements awarded that validly exist and are outstanding, including vested instruments. |
$ 18.10 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Granted, Weighted Average Exercise Price |
$ 0.00 |
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| Share-Based Compensation Arrangement By Share-Based award other than options exercised during the period |
0 |
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| Share-Based Compensation Arrangement other than Options forfeited during the period |
12,694 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Forfeitures In Period, Weighted Average Exercise Price |
$ 18.10 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Stock Appreciation Rights, Expirations In Period |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Expirations In Period, Weighted Average Exercise Price |
$ 0.00 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Vested And Expected To Vest, Outstanding, Number |
30,497 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Vested And Expected To Vest, Outstanding, Weighted Average Exercise Price |
$ 18.10 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Exercisable, Number |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Exercisable, Weighted Average Exercise Price |
$ 0 |
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Stock Settled [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number |
356,243 |
311,014 |
162,500 |
| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price |
$ 21.39 |
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$ 59.41 |
| Weighted-average exercise price of shares reserved for issuance under non-option equity instrument agreements awarded that validly exist and are outstanding, including vested instruments. |
$ 18.94 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
70,000 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Granted, Weighted Average Exercise Price |
$ 31.50 |
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| Share-Based Compensation Arrangement By Share-Based award other than options exercised during the period |
7,845 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Exercises In Period, Weighted Average Exercise Price |
$ 20.82 |
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| Share-Based Compensation Arrangement other than Options forfeited during the period |
16,926 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Forfeitures In Period, Weighted Average Exercise Price |
$ 18.50 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Stock Appreciation Rights, Expirations In Period |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Expirations In Period, Weighted Average Exercise Price |
$ 0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Vested And Expected To Vest, Outstanding, Number |
353,527 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Vested And Expected To Vest, Outstanding, Weighted Average Exercise Price |
$ 21.41 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Exercisable, Number |
97,938 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Exercisable, Weighted Average Exercise Price |
$ 19.78 |
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Cash Settled [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number |
76,750 |
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0 |
| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price |
$ 31.34 |
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| Weighted-average exercise price of shares reserved for issuance under non-option equity instrument agreements awarded that validly exist and are outstanding, including vested instruments. |
$ 0 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
76,750 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Granted, Weighted Average Exercise Price |
$ 31.34 |
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| Share-Based Compensation Arrangement By Share-Based award other than options exercised during the period |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Exercises In Period, Weighted Average Exercise Price |
$ 0 |
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| Share-Based Compensation Arrangement other than Options forfeited during the period |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Forfeitures In Period, Weighted Average Exercise Price |
$ 0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Stock Appreciation Rights, Expirations In Period |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Expirations In Period, Weighted Average Exercise Price |
$ 0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Vested And Expected To Vest, Outstanding, Number |
73,947 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Vested And Expected To Vest, Outstanding, Weighted Average Exercise Price |
$ 31.34 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Exercisable, Number |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Exercisable, Weighted Average Exercise Price |
$ 0 |
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Stock Settled [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number |
362,500 |
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0 |
| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price |
$ 31.25 |
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| Weighted-average exercise price of shares reserved for issuance under non-option equity instrument agreements awarded that validly exist and are outstanding, including vested instruments. |
$ 0 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
362,500 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Granted, Weighted Average Exercise Price |
$ 31.25 |
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| Share-Based Compensation Arrangement By Share-Based award other than options exercised during the period |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Exercises In Period, Weighted Average Exercise Price |
$ 0.00 |
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| Share-Based Compensation Arrangement other than Options forfeited during the period |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Forfeitures In Period, Weighted Average Exercise Price |
$ 0.00 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Stock Appreciation Rights, Expirations In Period |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Expirations In Period, Weighted Average Exercise Price |
$ 0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Vested And Expected To Vest, Outstanding, Number |
362,500 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Vested And Expected To Vest, Outstanding, Weighted Average Exercise Price |
$ 31.25 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Exercisable, Number |
0 |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Exercisable, Weighted Average Exercise Price |
$ 0.00 |
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