Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income (loss)	$ (154,910)	$ 44,864
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	29,623	28,972
Stock-based compensation expense	8,642	11,977
Deferred income taxes	163,173	1,477
Other, net	(130)	644
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(11,156)	(22,849)
Inventories	(28,293)	(19,306)
Prepaid expenses and other assets	4,103	1,614
Accounts payable	6,304	39,391
Accrued liabilities	(8,916)	(32,857)
Cash provided by operating activities	8,440	53,927
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(48,533)	(21,667)
Proceeds from sales of property, plant and equipment	142	3,582
Cash used in investing activities	(48,391)	(18,085)
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Proceeds from revolving credit facility borrowings	899,000	208,400
Repayments of revolving credit facility borrowings	(818,000)	(233,400)
Net proceeds from stock issuances	2,526	10,643
Repurchases of common stock	(45,485)	(13,623)
Holdback payment for a prior business combination	0	(2,262)
Cash provided by (used in) financing activities	38,041	(30,242)
Effect of exchange rate changes	163	1,352
Increase (decrease) in cash and cash equivalents	(1,747)	6,952
Cash and cash equivalents at beginning of period	406,661	398,288
Cash and cash equivalents at end of period	404,914	405,240
Cash paid during the period for:
Interest, net of capitalized interest	12,352	8,543
Income taxes, net of refunds	7,275	5,593
Unpaid purchases of property, plant and equipment at the end of period	$ 24,004	$ 34,015