|
Shareholders' Equity (Narrative) (Details) (USD $)
|
12 Months Ended |
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Sep. 30, 2010
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Share-based compensation expense |
$ 879,000 |
$ 264,000 |
$ 192,000 |
| Option vesting period, years |
3 years |
|
|
| Period from grant date in which options start to vest |
3 months |
|
|
| Weighted-average fair value of options |
|
$ 2.37 |
$ 1.43 |
| Total intrinsic value of options |
778,000 |
663,000 |
|
| Proceeds from exercise of stock options |
261,000 |
388,000 |
|
| Tax benefit realized from stock options exercised |
691,000 |
296,000 |
|
| Unrecognized compensation costs related to non-vested stock option arrangements |
234,000 |
|
|
| Weighted-average period for RSUs expense |
1 year 7 months 6 days |
|
|
| Dividend yield |
0.00% |
0.00% |
0.00% |
| Annualized estimated forfeiture rate |
10.00% |
|
|
| Shares authorized under the 2011 Plan |
789,161 |
|
|
| Shares available for future issuance under the 2011 Plan |
212,261 |
|
|
| Total number of unvested RSUs |
464,584 |
|
|
| Fair value of RSUs |
3,100,000 |
|
|
| Weighted-average fair value per share RSUs |
$ 10.61 |
|
|
|
$10 Per Share Market Price [Member] | Fourth Anniversary [Member]
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Number of restricted stock units subject to vesting condition, shares |
133,900 |
|
|
| Vesting condition price per share |
$ 10 |
|
|
|
$10 Per Share Market Price [Member] | Fifth Anniversary [Member]
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Vesting condition price per share |
$ 10 |
|
|
| Number of consecutive days for vesting period |
20 days |
|
|
|
$17.50 Per Share Market Price [Member] | Fourth Anniversary [Member]
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Number of restricted stock units subject to vesting condition, shares |
136,000 |
|
|
| Vesting condition price per share |
$ 17.50 |
|
|
|
Restricted Stock Units (RSUs) [Member]
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| RSU vesting rate |
33.33% |
|
|
| Fair value of RSUs |
|
1,200,000 |
65,000 |
| Weighted-average fair value per share RSUs |
|
$ 4.18 |
$ 2.40 |
| Restricted stock compensation expense |
709,000 |
147,000 |
51,000 |
| Total unrecognized compensation cost |
$ 3,900,000 |
|
|
| Weighted-average period for RSUs expense |
2 years 6 months |
|
|
|
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Expiration period from grant date |
10 years |
|
|
|
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Expiration period from grant date |
7 years |
|
|
|
Restricted Stock Units (RSUs) [Member] | $10 Per Share Market Price [Member] | Fifth Anniversary [Member]
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Number of restricted stock units subject to vesting condition, shares |
159,675 |
|
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