Interim Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Apr. 01, 2022	Mar. 26, 2021
Operating activities:
Net income including controlling interest	$ 116,529	$ 219,035
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	45,832	47,399
Stock-based compensation	60,355	50,726
Amortization of operating lease right-of-use assets	7,953	8,538
Amortization of premium on investments	673	697
Provision for doubtful accounts	2,333	(65)
Deferred income taxes	(19,363)	(16,992)
Gain on sale of assets	0	(13,871)
Other non-cash items affecting net income	560	(1,847)
Changes in operating assets and liabilities:
Accounts receivable, net	3,498	(102,791)
Contract assets, net	(76,447)	(72,197)
Inventories	(5,045)	10,398
Operating lease right-of-use assets	(265)	(1,729)
Prepaid expenses and other assets	(1,683)	10,552
Accounts payable and other liabilities	(37,472)	26,926
Income taxes, net	5,117	9,982
Contract liabilities	4,364	3,589
Operating lease liabilities	(7,924)	(6,987)
Other non-current liabilities	(4,356)	(5,735)
Net cash provided by operating activities	94,659	165,628
Investing activities:
Purchase of investments	(201,231)	(26,449)
Proceeds from sales of investment securities	5,107	4,594
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	29,055	18,620
Proceeds from Equity Method Investment, Distribution, Return of Capital	826	0
Purchases of property, plant and equipment	(26,053)	(28,887)
Proceeds from sale of assets	0	16,365
Payments to Acquire Businesses, Net of Cash Acquired	(38,228)	0
Purchases of intangible assets	(11,528)	0
Purchases of other investments	(5,000)	0
Net cash provided by/(used in) investing activities	(247,052)	(15,757)
Financing activities:
Proceeds from issuance of common stock	35,062	71,157
Repurchase of common stock	(120,486)	(110,775)
Payment of cash dividend	(50,681)	(44,574)
Distribution to controlling interest	(1,435)	(7,362)
Shares repurchased for tax withholdings on vesting of restricted stock	(32,720)	(29,216)
Net cash used in financing activities	(170,260)	(120,770)
Effect of foreign exchange rate changes on cash and cash equivalents	(1,541)	4,416
Net increase/(decrease) in cash, cash equivalents, and restricted cash	(324,194)	33,517
Cash, cash equivalents, and restricted cash at beginning of period	1,233,032	1,079,979
Cash, cash equivalents, and restricted cash at end of period	908,838	1,113,496
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	24,016	29,584
Non-cash investing activities and financing activities:
Change in property, plant, and equipment purchased, unpaid at period-end	$ (2,996)	$ 1,799