Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income	$ 48,021	$ 38,345
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Depreciation and amortization	27,635	28,735
Stock-based compensation expense	8,208	6,906
Deferred income taxes	3,447	3,005
Other, net	(99)	(322)
Changes in operating assets and liabilities:
Accounts receivable	(64,217)	65,449
Contract assets	46,534	(25,560)
Inventories	42,282	57,357
Prepaid expenses and other assets	(9,400)	2,372
Accounts payable	(66,657)	(139,304)
Accrued liabilities	26,057	(15,812)
Cash provided by operating activities	61,811	21,171
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property, plant and equipment, net of proceeds	(11,191)	(28,046)
Cash used in investing activities	(11,191)	(28,046)
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Repayments of long-term debt	4,688	4,688
Proceeds from revolving credit facility borrowings	331,300	717,000
Repayments of revolving credit facility borrowings	(331,300)	(717,000)
Net proceeds from stock issuances	1,050	4,852
Repurchases of common stock	(12,522)	(17,550)
Cash used in financing activities	(16,160)	(17,386)
Effect of exchange rate changes	1,044	84
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	35,504	(24,177)
Cash and cash equivalents at beginning of period	480,526	454,741
Cash and cash equivalents at end of period	516,030	430,564
Cash paid during the period for:
Interest, net of capitalized interest	1,096	4,725
Income taxes, net of refunds	5,205	4,888
Unpaid purchases of property, plant and equipment at the end of period	$ 11,635	$ 15,782