Consolidated Statements of Stockholders' Equity (Deficit) (USD $) In Thousands, unless otherwise specified	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Loss	Total
Balance at Sep. 30, 2011	$ 1,841	$ 681,256	$ (879,305)	$ (103)	$ (22,671)	$ (218,982)
Balance (in shares) at Sep. 30, 2011	184,057
Increase (Decrease) in Stockholders' Equity
Net earnings			233,064			233,064
Other comprehensive income					12,018	12,018
Repurchases and cancellations of common stock	(76)	(200,027)		103		(200,000)
Repurchase and cancellations of common stock (in shares)	(7,567)
Share-based compensation	1	16,851				16,852
Share-based compensation (in shares)	126
Stock issued for stock options	36	41,927				41,963
Stock issued for stock options (in shares)	3,625
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					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					164,425
Increase (Decrease) in Stockholders' Equity
Net earnings			245,993			245,993
Other comprehensive income					(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