Revenue from Contracts with Customers - Schedule of Impacts of Adoption of New Accounting Pronouncement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract assets	$ 90,841				$ 0				$ 90,841	$ 0		$ 76,417
Inventories, net	700,938				794,346				700,938	794,346		725,387
Other accrued liabilities	106,461				68,163				106,461	68,163		67,806
Retained earnings	1,178,677				1,062,246				1,178,677	1,062,246		1,070,061
Net sales	810,195	$ 799,644	$ 789,051	$ 765,544	771,178	$ 726,385	$ 698,651	$ 677,294	3,164,434	2,873,508	$ 2,528,052
Cost of sales									2,872,596	2,615,908	2,272,197
Gross profit	77,789	71,030	70,636	72,383	73,304	67,821	52,952	63,523	291,838	257,600	255,855
Operating income									142,055	118,283	129,908
Income before income taxes									125,955	107,610	121,823
Income tax expense									17,339	94,570	9,761
Net income	36,831	$ 24,801	$ 24,758	$ 22,226	$ 72,742	$ 26,501	$ 12,290	$ (98,493)	108,616	$ 13,040	$ 112,062
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract assets	90,841								90,841
Inventories, net	(81,895)								(81,895)
Other accrued liabilities	(375)								(375)
Retained earnings	9,321								9,321
Net sales									14,880
Cost of sales									12,934
Gross profit									1,946
Operating income									1,946
Income before income taxes									1,946
Income tax expense									440
Net income									1,506
Balance without the adoption of ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract assets	0								0
Inventories, net	782,833								782,833
Other accrued liabilities	106,836								106,836
Retained earnings	$ 1,169,356								1,169,356
Net sales									3,149,554
Cost of sales									2,859,662
Gross profit									289,892
Operating income									140,109
Income before income taxes									124,009
Income tax expense									16,899
Net income									$ 107,110
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