Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 677,294	$ 635,019
Cost of sales	613,771	570,663
Gross profit	63,523	64,356
Selling and administrative expenses	31,966	30,453
Operating income	31,557	33,903
Other income (expense):
Interest expense	(3,725)	(3,274)
Interest income	1,555	1,071
Miscellaneous	(346)	(674)
Income before income taxes	29,041	31,026
Income tax expense	127,534	2,847
Net (loss) income	$ (98,493)	$ 28,179
(Loss) earnings per share:
Basic (in dollars per share)	$ (2.93)	$ 0.84
Diluted (in dollars per share)	$ (2.93)	$ 0.82
Weighted average shares outstanding:
Basic (in shares)	33,567	33,534
Diluted (in shares)	33,567	34,544
Other comprehensive income (loss):
Derivative instrument fair value adjustment	$ 1,539	$ (5,403)
Foreign currency translation adjustments	2,142	(11,359)
Other comprehensive income (loss)	3,681	(16,762)
Total comprehensive (loss) income	$ (94,812)	$ 11,417