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Quarterly Financial Data (Unaudited) - Schedule Of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended								12 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Quarterly Financial Data [Abstract]
Net sales	$ 771,178	$ 726,385	$ 698,651	$ 677,294	$ 669,852	$ 618,832	$ 604,349	$ 635,019	$ 2,873,508	$ 2,528,052	$ 2,556,004
Gross profit (1)	(73,304)	(67,821)	(52,952)	(63,523)	(66,514)	(61,185)	(63,800)	(64,356)	(257,600)	(255,855)	(227,359)
Net income	72,742	$ 26,501	12,290	(98,493)	$ 29,009	$ 25,579	$ 29,295	$ 28,179	13,040	112,062	$ 76,427
One-time Employee Bonus Impact on Effective Income Tax Rate			$ 13,500
Tax Reform Income Tax Expense (Benefit)	(38,600)			$ 124,500					85,900
Additions (reductions) to valuation allowance	3,600								(32,900)	$ 14,900
Other Tax Expense (Benefit)	$ 1,100								$ (2,900)
Tax Reform Income Tax Expense, Per Share	$ (1.24)			$ 3.59
Antidilutive Securities Excluded from Computation of Net Income, Per Share				$ 0.09
Antidilutive Securities Excluded from Computation of Diluted Earnings Per Share				1.1
One-time Employee Bonus Impact of Effective Income Tax Rate, Per Share			$ 0.38
Earnings per share:
Basic (in dollars per share)	2.27	$ 0.81	0.37	$ (2.93)	$ 0.86	$ 0.76	$ 0.87	$ 0.84	$ 0.40	$ 3.33	$ 2.29
Diluted (in dollars per share)	$ 2.20	$ 0.79	$ 0.36	$ (2.93)	$ 0.84	$ 0.74	$ 0.84	$ 0.82	$ 0.38	$ 3.24	$ 2.24

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