Stockholders' Equity (Details) (USD $) Share data in Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Class of Stock [Line Items]
Preferred stock, shares authorized	5,000	5,000
Common stock, shares authorized	500,000	500,000
Stock authorized to repurchase	$ 100,000,000
Repurchases of common stock, shares	3,053	1,553	2,649
Repurchases of common stock, value	$ 74,871,000	$ 34,953,000	$ 54,921,000
Series A Junior Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized	500