Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income (loss)	$ 121,758	$ (96,315)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	88,441	89,134
Stock-based compensation expense	20,578	28,698
Deferred income taxes	27,182	174,060
Other, net	(1,361)	(881)
Changes in operating assets and liabilities:
Accounts receivable	(50,805)	(44,995)
Contract assets	(11,807)	0
Inventories	108,043	(137,036)
Prepaid expenses and other assets	2,144	359
Accounts payable	(172,654)	87,070
Accrued liabilities	61,249	(4,214)
Cash provided by operating activities	192,768	95,880
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(102,025)	(97,468)
Purchases of long-term investments	(499)	(2,019)
Proceeds from sales of property, plant and equipment	4,057	3,948
Cash used in investing activities	(98,467)	(95,539)
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Repayments of long-term debt	378,416	3,416
Proceeds from long-term debt	375,000	0
Proceeds from revolving credit facility borrowings	3,223,525	3,015,200
Repayments of revolving credit facility borrowings	(3,317,525)	(2,867,200)
Debt issuance costs	(2,727)	(1,701)
Net proceeds from stock issuances	12,719	3,890
Repurchases of common stock	(12,614)	(150,162)
Cash used in financing activities	(100,038)	(3,389)
Effect of exchange rate changes	482	1,164
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(5,255)	(1,884)
Cash and cash equivalents at beginning of period	419,528	406,661
Cash and cash equivalents at end of period	414,273	404,777
Cash paid during the period for:
Interest, net of capitalized interest	25,291	23,985
Income taxes, net of refunds	23,767	27,434
Unpaid purchases of property, plant and equipment at the end of period	$ 30,018	$ 32,529