Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Consolidated Balance Sheets
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, Authorized shares	500,000	500,000
Common stock, shares issued	180,548	184,502
Common stock, shares outstanding	180,241	184,057
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, Authorized shares	50,000	50,000
Preferred stock, shares issued	0	0
Treasury stock, shares		15