CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Paid-in-Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Sep. 30, 2013	$ 530,677	$ 348	$ 1,110,198	$ (1,751,057)	$ 1,192,096	$ (20,908)
Beginning Balance (in shares) at Sep. 30, 2013		34,786
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	25,631		25,631
Issuance of treasury stock under employee stock plans	7,251	8	(20,162)	27,405
Issuance of treasury stock under employee stock plans (in shares)		840
Tax effect from share-based payment arrangements	5,844		5,844
Repurchases of common stock	(159,034)	(27)		(159,007)
Repurchases of common stock (shares)		(2,771)
Dividends paid ($0.06 per share)	(2,074)				(2,074)
Net income	58,276				58,276
Foreign currency translation adjustments	12,603					12,603
Ending Balance at Jun. 30, 2014	$ 479,174	$ 329	$ 1,121,511	$ (1,882,659)	$ 1,248,298	$ (8,305)
Ending Balance (in shares) at Jun. 30, 2014		32,855