Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jul. 07, 2013	Sep. 30, 2012
Stockholders’ equity:
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000,000	15,000,000
Preferred stock, shares issued	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	77,991,876	75,827,894
Treasury stock at cost, shares	34,728,194	31,955,606