Interim Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 29, 2024	Mar. 31, 2023
Operating activities:
Net income including noncontrolling interest	$ 165,795	$ 175,331
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35,890	40,388
Stock-based compensation	60,809	61,067
Amortization of operating lease right-of-use assets	5,847	6,565
Amortization of premium on investments	(1,757)	37
Benefit from credit losses	(1,454)	(2,072)
Deferred income taxes	(6,779)	(19,544)
Other non-cash items affecting net income	(2,500)	(4,417)
Changes in operating assets and liabilities:
Accounts receivable, net	(18,509)	(37,769)
Contract assets, net	(61,008)	(99,162)
Inventories	(7,836)	(4,728)
Operating lease right-of-use assets	(7,848)	(2,643)
Prepaid expenses and other assets	33,527	12,943
Accounts payable and accrued liabilities	3,923	21,609
Income taxes, net	5,215	17,370
Contract liabilities	2,651	3,852
Operating lease liabilities	1,028	(5,415)
Other non-current liabilities	(17,176)	(2,475)
Net cash provided by operating activities	189,818	160,937
Investing activities:
Purchases of marketable securities	(104,135)	(80,561)
Proceeds from sales of marketable securities	4,451	52,345
Proceeds from maturities of marketable securities	97,459	94,843
Purchases of property, plant, and equipment	(15,015)	(14,741)
Net cash provided by (used in) investing activities	(17,240)	51,886
Financing activities:
Proceeds from issuance of common stock	29,345	21,394
Repurchase of common stock	(104,999)	(99,276)
Payment of cash dividend	(57,268)	(51,741)
Distribution to noncontrolling interest	(1,047)	(266)
Shares repurchased for tax withholdings on vesting of restricted stock	(36,054)	(26,800)
Equity issued in connection with business combination	722	0
Payment Of Deferred Consideration For Prior Business Combination	0	(500)
Net cash used in financing activities	(169,301)	(157,189)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	3,113	9,415
Net increase/(decrease) in cash, cash equivalents, and restricted cash	6,390	65,049
Cash, cash equivalents, and restricted cash at beginning of period	817,966	628,371
Cash, cash equivalents, and restricted cash at end of period	824,356	693,420
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	38,582	27,468
Non-cash investing activities and financing activities:
Change in property, plant, and equipment purchased, unpaid at period-end	$ 7,957	$ 1,635