Quarterly Data - Unaudited Net Sales And Earnings (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Jan. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Oct. 02, 2010
Quarterly Financial Data [Abstract]
Net sales	$ 632,727	$ 611,221	$ 624,970	$ 600,618	$ 619,061	$ 582,959	$ 574,226	$ 554,434	$ 2,469,536	$ 2,330,680	$ 2,114,252
Gross profit	192,321	183,418	184,430	185,135	178,792	168,884	167,248	164,553	745,304	679,477	612,611
Net earnings	$ 41,797	$ 38,871	$ 35,421	$ 36,373	$ 38,161	$ 33,838	$ 30,615	$ 33,407	$ 152,462	$ 136,021	$ 108,094
Net earnings per share, Basic	$ 0.92	$ 0.86	$ 0.78	$ 0.80	$ 0.84	$ 0.74	$ 0.67	$ 0.74	$ 3.37	$ 2.99	$ 2.38
Net earnings per share, Diluted	$ 0.91	$ 0.85	$ 0.77	$ 0.80	$ 0.83	$ 0.73	$ 0.66	$ 0.73	$ 3.33	$ 2.95	$ 2.36