Quarterly Financial Data (Unaudited) - Schedule Of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 03, 2020	Jul. 04, 2020	Apr. 04, 2020	Jan. 04, 2020	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Quarterly Financial Data [Abstract]
Net sales	$ 913,227	$ 857,394	$ 767,364	$ 852,409	$ 810,195	$ 799,644	$ 789,051	$ 765,544	$ 3,390,394	$ 3,164,434	$ 2,873,508
Gross profit	89,190	82,881	61,445	79,190	77,789	71,030	70,636	72,383	312,706	291,838	257,600
Net income	$ 37,705	$ 35,842	12,926	31,006	36,831	$ 24,801	$ 24,758	22,226	117,479	108,616	13,040
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)				(1,900)				$ 7,000
Special Tax Items Expense (Benefit)				$ 1,100
Restructuring and impairment charges			6,000		1,700				6,003	1,678	$ 0
Restructuring costs, net of tax			$ 5,400		1,500
Tax Expense (Benefit) of Undistributed Earnings of Foreign Subsidiaries					$ (10,500)				$ (12,000)	$ (10,500)
Special Tax Items Expense (Benefits), per share				$ (0.03)
Restructuring Costs, Per Share			$ 0.18		$ 0.05
Tax Reform Income Tax Expense (Benefit), Per Share								$ 0.23
Tax Expense (Benefit) of Undistributed Earnings of Foreign Subsidiaries Per Share					(0.35)
Earnings per share:
Basic (in dollars per share)	$ 1.29	$ 1.23	0.44	1.06	1.26	$ 0.83	$ 0.81	0.71	$ 4.02	$ 3.59	$ 0.40
Diluted (in dollars per share)	$ 1.26	$ 1.20	$ 0.43	$ 1.03	$ 1.23	$ 0.81	$ 0.79	$ 0.69	$ 3.93	$ 3.50	$ 0.38