Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income (loss)	$ 78,837	$ (130,278)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	58,880	59,502
Stock-based compensation expense	12,442	18,937
Deferred income taxes	23,410	165,098
Other, net	587	(674)
Changes in operating assets and liabilities:
Accounts receivable	(129,741)	22,967
Contract assets	(26,219)	0
Inventories	16,559	(70,171)
Prepaid expenses and other assets	436	(7,487)
Accounts payable	(85,037)	(34,467)
Accrued liabilities	77,148	10,696
Cash provided by operating activities	27,302	34,123
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(72,962)	(71,031)
Purchases of long-term investments	0	(2,019)
Proceeds from sales of property, plant and equipment	1,139	158
Cash used in investing activities	(71,823)	(72,892)
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Proceeds from revolving credit facility borrowings	2,242,225	2,025,300
Repayments of revolving credit facility borrowings	(2,207,225)	(1,869,300)
Debt issuance costs	(2,003)	(1,701)
Net proceeds from stock issuances	9,339	3,439
Repurchases of common stock	(12,010)	(120,539)
Cash provided by financing activities	30,326	37,199
Effect of exchange rate changes	161	186
Decrease in cash and cash equivalents	(14,034)	(1,384)
Cash and cash equivalents at beginning of period	419,528	406,661
Cash and cash equivalents at end of period	405,494	405,277
Cash paid during the period for:
Interest, net of capitalized interest	13,589	13,780
Income taxes, net of refunds	13,237	15,369
Unpaid purchases of property, plant and equipment at the end of period	$ 31,780	$ 28,139