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Share-Based Incentive Compansation Plans (Details) (USD $)
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3 Months Ended |
6 Months Ended |
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Feb. 28, 2014
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Feb. 28, 2013
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Feb. 28, 2014
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Feb. 28, 2013
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| Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items] |
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| Share-based incentive compensation |
$ 1,670,000 |
$ 1,891,000 |
$ 2,996,000 |
$ 2,597,000 |
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |
10,500,000 |
|
10,500,000 |
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| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |
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|
1 year 9 months 18 days |
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Time Based Restricted Stock Awards [Member]
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| Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items] |
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| Awards granted |
42,138 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |
$ 34.42 |
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Time Based and Performance Based Restricted Stock Awards [Member]
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| Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items] |
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| Share-based incentive compensation |
873,000 |
1,041,000 |
2,199,000 |
1,747,000 |
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Board of Directors Unrestricted Awards [Member]
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| Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items] |
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| Awards granted |
23,150 |
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| Share-based incentive compensation |
$ 797,000 |
$ 850,000 |
$ 797,000 |
$ 850,000 |
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Performance Based Restricted Stock Awards [Member]
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| Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items] |
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| Awards granted |
315,941 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |
$ 29.14 |
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2006 Incentive Plan [Member]
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| Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |
524,749 |
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524,749 |
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2010 Rewards Plan [Member]
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| Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |
22,949 |
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22,949 |
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