Quarterly Financial Data (Unaudited) - Schedule Of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Quarterly Financial Data [Abstract]
Net sales	$ 669,852	$ 618,832	$ 604,349	$ 635,019	$ 653,064	$ 667,616	$ 618,660	$ 616,664	$ 2,528,052	$ 2,556,004	$ 2,654,290
Gross profit	66,514	61,185	63,800	64,356	61,530	62,498	53,272	50,059	255,855	227,359	239,550
Net income	$ 29,009	$ 25,579	$ 29,295	$ 28,179	$ 19,093	$ 26,099	$ 16,787	$ 14,448	$ 112,062	$ 76,427	$ 94,332
Earnings per share:
Basic (in dollars per share)	$ 0.86	$ 0.76	$ 0.87	$ 0.84	$ 0.57	$ 0.78	$ 0.50	$ 0.43	$ 3.33	$ 2.29	$ 2.81
Diluted (in dollars per share)	$ 0.84	$ 0.74	$ 0.84	$ 0.82	$ 0.56	$ 0.76	$ 0.50	$ 0.42	$ 3.24	$ 2.24	$ 2.74