Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jan. 22, 2012	Oct. 02, 2011
Stockholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000,000	15,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	75,125,397	74,992,487
Treasury stock at cost, shares	31,072,631	30,746,099