Revenue From Contracts with Customers - Schedule of Impacts of Adoption of New Accounting Pronouncement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Sep. 30, 2018	Sep. 29, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract assets	$ 105,201		$ 105,201		$ 76,417	$ 0
Inventories, net	757,206		757,206		725,387	794,346
Other accrued liabilities	107,432		107,432		67,806	68,163
Retained earnings	1,141,846		1,141,846		1,070,061	$ 1,062,246
Net sales	799,644	$ 726,385	2,354,239	$ 2,102,330
Cost of sales	728,614	658,564	2,140,190	1,918,034
Gross profit	71,030	67,821	214,049	184,296
Operating income	34,403	32,446	104,528	81,318
Income before income taxes	29,718	29,552	92,529	73,310
Income tax expense	4,917	3,051	20,744	133,012
Net income (loss)	24,801	$ 26,501	71,785	$ (59,702)
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract assets	105,201		105,201
Inventories, net	(96,534)		(96,534)
Other accrued liabilities	(425)		(425)
Retained earnings	9,092		9,092
Net sales	17,728		29,272
Cost of sales	17,741		27,576
Gross profit	(13)		1,696
Operating income	(13)		1,696
Income before income taxes	(13)		1,696
Income tax expense	1		419
Net income (loss)	(14)		1,277
Balance without the adoption of ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract assets	0		0
Inventories, net	853,740		853,740
Other accrued liabilities	107,857		107,857
Retained earnings	1,132,754		1,132,754
Net sales	781,916		2,324,967
Cost of sales	710,873		2,112,614
Gross profit	71,043		212,353
Operating income	34,416		102,832
Income before income taxes	29,731		90,833
Income tax expense	4,916		20,325
Net income (loss)	$ 24,815		$ 70,508
Adjustments due to the adoption of ASU 2014-09 | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract assets					76,417
Inventories, net					(68,959)
Other accrued liabilities					(357)
Retained earnings					$ 7,815