Consolidated Statements of Stockholders' 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, 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 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
Increase (Decrease) in Stockholders' Equity
Net earnings			235,087			235,087
Other comprehensive 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
Increase (Decrease) in Stockholders' Equity
Net earnings			222,942			$ 222,942
Other comprehensive loss					(22,346)	(22,346)
Repurchases and cancellations of common stock	$ (79)	(28,361)	(181,833)	$ 2,961		(207,312)
Repurchase and cancellations of common stock (in shares)	(7,950)
Share-based compensation	$ 1	12,579				12,580
Share-based compensation (in shares)	131
Stock issued for stock options	$ 9	$ 15,782				15,791
Stock issued for stock options (in shares)	938
Balance at Sep. 30, 2016	$ 1,446		$ (177,561)		$ (100,051)	$ (276,166)
Balance (in shares) at Sep. 30, 2016	144,571					144,571