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Interim Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2023
Apr. 01, 2022
Operating activities:    
Net income including noncontrolling interest $ 175,331 $ 116,529
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 40,388 45,832
Stock-based compensation 61,067 60,355
Amortization of operating lease right-of-use assets 6,565 7,953
Amortization of premium on investments 37 673
Provision for/(benefit from) credit losses (2,072) 2,333
Deferred income taxes (19,544) (19,363)
Other non-cash items affecting net income (4,417) 560
Changes in operating assets and liabilities:    
Accounts receivable, net (37,769) 3,498
Contract assets, net (99,162) (76,447)
Inventories (4,728) (5,045)
Operating lease right-of-use assets (2,643) (265)
Prepaid expenses and other assets 12,943 (1,683)
Accounts payable and accrued liabilities 21,609 (37,472)
Income taxes, net 17,370 5,117
Contract liabilities 3,852 4,364
Operating lease liabilities (5,415) (7,924)
Other non-current liabilities (2,475) (4,356)
Net cash provided by operating activities 160,937 94,659
Investing activities:    
Purchases of marketable securities (80,561) (201,231)
Proceeds from sales of marketable securities 52,345 5,107
Proceeds from maturities of marketable securities 94,843 29,055
Proceeds from Equity Method Investment, Distribution, Return of Capital 0 826
Purchases of property, plant, and equipment (14,741) (26,053)
Payments for business combinations, net of cash acquired 0 (38,228)
Payments To Acquire Intangible Assets, Net Of Holdbacks For Indemnifications 0 11,528
Purchases of intangible assets 0 (11,528)
Purchases of other investments 0 (5,000)
Net cash provided by/(used in) investing activities 51,886 (247,052)
Financing activities:    
Proceeds from issuance of common stock 21,394 35,062
Repurchase of common stock (99,276) (120,486)
Payment of cash dividend (51,741) (50,681)
Distribution to noncontrolling interest (266) (1,435)
Shares repurchased for tax withholdings on vesting of restricted stock (26,800) (32,720)
Payment Of Deferred Consideration For Prior Business Combination (500) 0
Net cash used in financing activities (157,189) (170,260)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash 9,415 (1,541)
Net increase/(decrease) in cash, cash equivalents, and restricted cash 65,049 (324,194)
Cash, cash equivalents, and restricted cash at beginning of period 628,371 1,233,032
Cash, cash equivalents, and restricted cash at end of period 693,420 908,838
Supplemental disclosure:    
Cash paid for income taxes, net of refunds received 27,468 24,016
Non-cash investing activities and financing activities:    
Change in property, plant, and equipment purchased, unpaid at period-end $ 1,635 $ (2,996)