Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income (loss)	$ 141,515	$ (95,533)	$ 138,833
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	116,949	118,820	118,751
Stock-based compensation expense	30,844	32,825	37,920
Deferred income taxes	54,668	173,591	37,892
Goodwill impairment	0	30,610	0
Other, net	2,219	1,777	4,188
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	54,947	(69,076)	(136,072)
Contract asset	(20,814)	0	0
Inventories	121,383	(324,168)	(104,468)
Prepaid expenses and other assets	10,018	7,797	12,303
Accounts payable	(182,521)	268,421	130,648
Accrued liabilities	53,757	11,360	10,966
Cash provided by operating activities	382,965	156,424	250,961
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(134,674)	(118,881)	(111,833)
Proceeds from sales of property, plant and equipment	7,532	4,722	3,935
Purchases of long-term investments	(499)	(2,019)	0
Cash used in investing activities	(127,641)	(116,178)	(107,898)
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Proceeds from revolving credit facility borrowings	3,884,325	4,040,600	932,770
Repayments of revolving credit facility borrowings	(4,099,325)	(3,910,600)	(872,770)
Repayments of long-term debt	(378,416)	(3,416)	(43,416)
Proceeds from long-term debt	375,000	0	0
Debt issuance costs	(2,727)	0	0
Net proceeds from stock issuances	13,539	4,407	27,129
Repurchases of common stock	(12,614)	(157,625)	(176,944)
Other, net	0	(1,701)	(2,262)
Cash used in financing activities	(220,218)	(28,335)	(135,493)
Effect of exchange rate changes	107	956	803
Increase in cash and cash equivalents	35,213	12,867	8,373
Cash and cash equivalents at beginning of year	419,528	406,661	398,288
Cash and cash equivalents at end of year	454,741	419,528	406,661
Cash paid during the year:
Interest, net of capitalized interest	30,143	26,156	17,983
Income taxes, net of refunds	32,132	34,819	20,417
Noncash Investing and Financing Items:
Unpaid purchases of property, plant and equipment at end of period	$ 27,279	$ 49,546	$ 49,831