Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 29, 2013	Sep. 30, 2012
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	78,515,171	75,827,894
Treasury stock at cost, shares	35,926,269	31,955,606