Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 27, 2015	Sep. 28, 2014
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	81,096,156	80,127,387
Treasury stock at cost, shares	45,314,529	41,571,752