Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Loss	Total
Balance at Sep. 30, 2012	$ 1,802	$ 540,007	$ (646,241)		$ (10,653)	$ (115,085)
Balance (in shares) at Sep. 30, 2012	180,241
Increase (Decrease) in Stockholders' Equity
Net earnings			261,151			261,151
Other comprehensive income (loss)					835	835
Repurchases and cancellations of common stock	$ (189)	(508,278)		$ (1,237)		(509,704)
Repurchase and cancellations of common stock (in shares)	(18,894)
Share-based compensation	$ 1	19,200				19,201
Share-based compensation (in shares)	126
Stock issued for stock options	$ 30	40,093				40,123
Stock issued for stock options (in shares)	2,952
Balance at Sep. 30, 2013	$ 1,644	91,022	(385,090)	(1,237)	(9,818)	(303,479)
Balance (in shares) at Sep. 30, 2013	164,425
Increase (Decrease) in Stockholders' Equity
Net earnings			245,993			245,993
Other comprehensive income (loss)					(18,730)	(18,730)
Repurchases and cancellations of common stock	$ (126)	(153,447)	(180,955)	1,237		(333,291)
Repurchase and cancellations of common stock (in shares)	(12,633)
Share-based compensation	$ 2	22,105				22,107
Share-based compensation (in shares)	149
Stock issued for stock options	$ 27	40,320				40,347
Stock issued for stock options (in shares)	2,727
Balance at Sep. 30, 2014	$ 1,547		(320,052)		(28,548)	$ (347,053)
Balance (in shares) at Sep. 30, 2014	154,668					154,668
Increase (Decrease) in Stockholders' Equity
Net earnings			235,087			$ 235,087
Other comprehensive income (loss)					(49,157)	(49,157)
Repurchases and cancellations of common stock	$ (80)	(90,813)	(133,705)	(2,961)		(227,559)
Repurchase and cancellations of common stock (in shares)	(7,977)
Share-based compensation	$ 2	16,776				16,778
Share-based compensation (in shares)	184
Stock issued for stock options	$ 46	$ 74,037				74,083
Stock issued for stock options (in shares)	4,577
Balance at Sep. 30, 2015	$ 1,515		$ (218,670)	$ (2,961)	$ (77,705)	$ (297,821)
Balance (in shares) at Sep. 30, 2015	151,452					151,452