Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income (loss)	$ 37,952	$ (154,910)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	29,792	29,623
Stock-based compensation expense	5,816	8,642
Deferred income taxes	11,583	163,173
Other, net	353	(130)
Changes in operating assets and liabilities:
Accounts receivable	(160,974)	(11,156)
Contract assets	(43,998)	0
Inventories	(30,708)	(28,293)
Prepaid expenses and other assets	3,033	4,103
Accounts payable	(2,845)	6,304
Accrued liabilities	71,560	(8,916)
Cash provided by (used in) operating activities	(78,436)	8,440
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(37,166)	(48,533)
Proceeds from sales of property, plant and equipment	575	142
Cash used in investing activities	(36,591)	(48,391)
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Proceeds from revolving credit facility borrowings	1,043,825	899,000
Repayments of revolving credit facility borrowings	(928,825)	(818,000)
Debt issuance costs	(2,003)	0
Net proceeds from stock issuances	3,568	2,526
Repurchases of common stock	(11,842)	(45,485)
Cash provided by financing activities	104,723	38,041
Effect of exchange rate changes	66	163
Decrease in cash and cash equivalents	(10,238)	(1,747)
Cash and cash equivalents at beginning of period	419,528	406,661
Cash and cash equivalents at end of period	409,290	404,914
Cash paid during the period for:
Interest, net of capitalized interest	10,895	12,352
Income taxes, net of refunds	4,923	7,275
Unpaid purchases of property, plant and equipment at the end of period	$ 41,910	$ 24,004