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Consolidated Statements Of Stockholders' Equity (USD $) In Thousands | Other Comprehensive Income (Loss) [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Sep. 30, 2009 |  | $ 115 | $ 29,401 | $ 219,961 | $ (2,716) | $ 246,761
Balance, shares at Sep. 30, 2009 |  | 11,480 |  |  |  |
Net income (loss) | 25,008 |  |  | 25,008 |  | 25,008
Foreign currency translation adjustments | 1,467 |  |  |  | 1,467 | 1,467
Exercise of stock options |  | 1 | 1,699 |  |  | 1,700
Exercise of stock options, shares |  | 109 |  |  |  |
Stock-based compensation |  | 1 | 791 |  |  | 792
Stock-based compensation, shares |  | 58 |  |  |  |
Income tax benefit from stock options exercised |  |  | 878 |  |  | 878
Amortization of restricted stock |  |  | 467 |  |  | 467
Issuance of restricted stock |  |  | 333 |  |  | 333
Issuance of restricted stock, shares |  | 30 |  |  |  |
Unrealized (loss) gain on cash flow hedges, net of tax of $265 and $94 for the period ended 2010 and 2011 respectively | (206) |  |  |  | (206) | (206)
Postretirement benefit adjustment, net of tax of $58, $60 and $20 for the period ended 2010, 2011 and 2012 respectively | 103 |  |  |  | 103 | 103
Total comprehensive income (loss) | 26,372 |  |  | 25,008 | 1,364 | 26,372
Balance at Sep. 30, 2010 |  | 117 | 33,569 | 244,969 | (1,352) | 277,303
Balance, shares at Sep. 30, 2010 |  | 11,677 |  |  |  |
Net income (loss) | (2,715) |  |  | (2,715) |  | (2,715)
Foreign currency translation adjustments | (19) |  |  |  | (19) | (19)
Exercise of stock options |  |  | 495 |  |  | 495
Exercise of stock options, shares |  | 27 |  |  |  |
Stock-based compensation |  |  | (1,223) |  |  | (1,223)
Stock-based compensation, shares |  | 20 |  |  |  |
Income tax benefit from stock options exercised |  |  | 180 |  |  | 180
Amortization of restricted stock |  |  | 280 |  |  | 280
Issuance of restricted stock |  |  | 1,042 |  |  | 1,042
Issuance of restricted stock, shares |  | 28 |  |  |  |
Unrealized (loss) gain on cash flow hedges, net of tax of $265 and $94 for the period ended 2010 and 2011 respectively | 111 |  |  |  | 111 | 111
Postretirement benefit adjustment, net of tax of $58, $60 and $20 for the period ended 2010, 2011 and 2012 respectively | (111) |  |  |  | (111) | (111)
Total comprehensive income (loss) | (2,734) |  |  | (2,715) | (19) | (2,734)
Balance at Sep. 30, 2011 |  | 117 | 34,343 | 242,254 | (1,371) | 275,343
Balance, shares at Sep. 30, 2011 |  | 11,752 |  |  |  |
Net income (loss) | 29,657 |  |  | 29,657 |  | 29,657
Foreign currency translation adjustments | 833 |  |  |  | 833 | 833
Exercise of stock options |  | 1 | 1,798 |  |  | 1,799
Exercise of stock options, shares |  | 98 |  |  |  |
Stock-based compensation |  |  | 1,004 |  |  | 1,004
Stock-based compensation, shares |  | 7 |  |  |  |
Income tax benefit from stock options exercised |  |  | 589 |  |  | 589
Amortization of restricted stock |  |  | 135 |  |  | 135
Issuance of restricted stock |  | 1 | 583 |  |  | 584
Issuance of restricted stock, shares |  | 74 |  |  |  |
Retirement of stock |  | (15) |  |  |  |
Postretirement benefit adjustment, net of tax of $58, $60 and $20 for the period ended 2010, 2011 and 2012 respectively | 159 |  |  |  | 159 | 159
Total comprehensive income (loss) | 30,649 |  |  | 29,657 | 992 | 30,649
Balance at Sep. 30, 2012 |  | $ 119 | $ 38,452 | $ 271,911 | $ (379) | $ 310,103
Balance, shares at Sep. 30, 2012 |  | 11,916 |  |  |  |

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