Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Income Statement [Abstract]
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
Selling and administrative expenses	36,627	35,375	109,521	102,978
Operating income	34,403	32,446	104,528	81,318
Other income (expense):
Interest expense	(3,711)	(2,910)	(9,105)	(10,182)
Interest income	445	1,068	1,410	4,049
Miscellaneous, net	(1,419)	(1,052)	(4,304)	(1,875)
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)
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.83	$ 0.81	$ 2.34	$ (1.79)
Diluted (in dollars per share)	$ 0.81	$ 0.79	$ 2.28	$ (1.79)
Weighted average shares outstanding:
Basic (in shares)	29,912	32,796	30,637	33,300
Diluted (in shares)	30,635	33,651	31,420	33,300
Other comprehensive income:
Derivative instrument fair value adjustments	$ (406)	$ (5,023)	$ 1,956	$ (2,255)
Foreign currency translation adjustments	(679)	(7,965)	(2,035)	(1,050)
Other comprehensive loss	(1,085)	(12,988)	(79)	(3,305)
Total comprehensive income (loss)	$ 23,716	$ 13,513	$ 71,706	$ (63,007)