CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest in VIE	Total
Balance at Sep. 30, 2012	$ 12,574	$ 721,333	$ (20,658)	$ (36,078)	$ (49)
Balance (in shares) at Sep. 30, 2012	26,736
Increase (Decrease) in Stockholders' Equity
Net income		25,086			183	$ 25,086
Other comprehensive loss, net of tax			17,855
Stock- based compensation	$ 3,251
Cash dividends paid		(6,417)
Balance at Sep. 30, 2013	$ 15,825	740,002	(2,803)	(36,078)	134
Balance (in shares) at Sep. 30, 2013	26,736
Increase (Decrease) in Stockholders' Equity
Net income		69,491			89	69,491
Other comprehensive loss, net of tax			(2,569)
Stock issued under equity incentive plans, value	$ 113	(5)
Stock issued under equity incentive plans, shares	75
Purchase of common stock, value	$ (1,204)
Purchase of common stock, shares	(22)
Stock- based compensation	$ 5,625
Tax benefit (expense) from equity incentive plans	310
Cash dividends paid		(6,429)
Balance at Sep. 30, 2014	$ 20,669	803,059	(5,372)	(36,078)	223	782,501
Balance (in shares) at Sep. 30, 2014	26,789
Increase (Decrease) in Stockholders' Equity
Net income		22,885			29	22,885
Other comprehensive loss, net of tax			(46,464)
Stock issued under equity incentive plans, value		(46)
Stock issued under equity incentive plans, shares	160
Purchase of common stock, value	$ (2,652)
Purchase of common stock, shares	(66)
Stock- based compensation	$ 8,325
Purchase of noncontrolling interest	(749)				$ (252)
Tax benefit (expense) from equity incentive plans	(33)
Cash dividends paid		(7,256)
Balance at Sep. 30, 2015	$ 25,560	$ 818,642	$ (51,836)	$ (36,078)		$ 756,288
Balance (in shares) at Sep. 30, 2015	26,883