Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings (Accumulated Loss)	Treasury Stock	Total
Balance at Sep. 30, 2013	$ 31,000	$ 206,861,000	$ 518,000	$ 107,469,000		$ 314,879,000
Balance (in shares) at Sep. 30, 2013	31,811,764
Increase (Decrease) in Stockholders' Equity
Common stock repurchase	$ (3,000)				$ (44,870,000)	$ (44,873,000)
Common stock repurchase (in shares)					(2,962,978)	(2,962,978)
Common stock retired		(22,713,000)		(22,157,000)	$ 44,870,000
Common stock retired (in shares)	(2,962,978)				2,962,978
Exercise of common stock options and restricted stock		4,146,000				$ 4,146,000
Exercise of common stock options and restricted stock (in shares)	819,364
Compensation expense and incremental tax benefit from grant of common stock options and issuance of restricted stock		16,410,000				16,410,000
Net (loss) income				30,390,000		30,390,000
Defined benefit pension plan- unrecognized amounts, net of taxes			(927,000)			(927,000)
Foreign currency translation			(3,042,000)			(3,042,000)
Balance at Sep. 30, 2014	$ 28,000	204,704,000	(3,451,000)	115,702,000		316,983,000
Balance (in shares) at Sep. 30, 2014	29,668,150
Increase (Decrease) in Stockholders' Equity
Exercise of common stock options and restricted stock	$ 1,000	105,000				106,000
Exercise of common stock options and restricted stock (in shares)	358,073
Compensation expense and incremental tax benefit from grant of common stock options and issuance of restricted stock		5,903,000				5,903,000
Net (loss) income				(104,815,000)		(104,815,000)
Defined benefit pension plan- unrecognized amounts, net of taxes			1,101,000			1,101,000
Foreign currency translation			(3,276,000)			(3,276,000)
Balance at Sep. 30, 2015	$ 29,000	210,712,000	(5,626,000)	10,887,000		216,002,000
Balance (in shares) at Sep. 30, 2015	30,026,223
Increase (Decrease) in Stockholders' Equity
Exercise of common stock options and restricted stock		9,000				9,000
Exercise of common stock options and restricted stock (in shares)	716,439
Compensation expense and incremental tax benefit from grant of common stock options and issuance of restricted stock		9,471,000				9,471,000
Net (loss) income				(59,926,000)		(59,926,000)
Defined benefit pension plan- unrecognized amounts, net of taxes			(2,547,000)			(2,547,000)
Foreign currency translation			(398,000)			(398,000)
Balance at Sep. 30, 2016	$ 29,000	$ 220,192,000	$ (8,571,000)	$ (49,039,000)		$ 162,611,000
Balance (in shares) at Sep. 30, 2016	30,742,662