Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income (loss)	$ 139,713	$ 141,515	$ (95,533)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	114,218	116,949	118,820
Stock-based compensation expense	26,235	30,844	32,825
Deferred income taxes	13,567	54,668	173,591
Impairment of goodwill and other assets	8,409	0	30,610
Other, net	(239)	2,219	1,777
Changes in operating assets and liabilities:
Accounts receivable	83,623	54,947	(69,076)
Contract assets	(283)	(20,814)	0
Inventories	39,564	121,383	(324,168)
Prepaid expenses and other assets	17,798	10,018	7,797
Accounts payable	(106,640)	(182,521)	268,421
Accrued liabilities	(35,410)	53,757	11,360
Cash provided by operating activities	300,555	382,965	156,424
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(65,982)	(134,674)	(118,881)
Proceeds from sales of property, plant and equipment	1,573	7,532	4,722
Purchases of investments	(30,000)	(499)	(2,019)
Sale of investments	30,000	0	0
Cash used in investing activities	(64,409)	(127,641)	(116,178)
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Proceeds from revolving credit facility borrowings	1,909,000	3,884,325	4,040,600
Repayments of revolving credit facility borrowings	(1,909,000)	(4,099,325)	(3,910,600)
Repayments of long-term debt	(39,048)	(378,416)	(3,416)
Proceeds from long-term debt	0	375,000	0
Debt issuance costs	0	(2,727)	0
Net proceeds from stock issuances	7,793	13,539	4,407
Repurchases of common stock	(179,025)	(12,614)	(157,625)
Other, net	0	0	(1,701)
Cash used in financing activities	(210,280)	(220,218)	(28,335)
Effect of exchange rate changes	(81)	107	956
Increase in cash and cash equivalents	25,785	35,213	12,867
Cash and cash equivalents at beginning of year	454,741	419,528	406,661
Cash and cash equivalents at end of year	480,526	454,741	419,528
Cash paid during the year:
Interest, net of capitalized interest	20,477	30,143	26,156
Income taxes, net of refunds	30,700	32,132	34,819
Noncash Investing and Financing Items:
Unpaid purchases of property, plant and equipment at end of period	$ 12,371	$ 27,279	$ 49,546