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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Cash flows from operating activities    
Net income (loss) $ 94,765 $ (23,286)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation expense 46,386 64,789
Depreciation and amortization 36,924 48,657
Restructuring and other charges 1,088 6,323
Provision for excess and obsolete inventory 1,573 9,242
Deferred income taxes 386 942
Other 5,078 2,432
Foreign currency transaction loss 2,122 572
Changes in operating assets and liabilities:    
Accounts receivable (53,604) (49,010)
Inventories 11,303 106,223
Other assets (15,882) 11,616
Accounts payable and accrued expenses 6,021 (55,341)
Accrued compensation 10,330 10,352
Deferred revenue (157) (1,033)
Other liabilities (2,166) 1,470
Net cash provided by operating activities 144,167 133,948
Cash flows from investing activities    
Purchases of marketable securities (44,616) (43,949)
Purchases of property and equipment (16,681) (23,418)
Maturities of marketable securities 43,340 43,200
Net cash used in investing activities (17,957) (24,167)
Cash flows from financing activities    
Payments for repurchase of common stock (95,277) (60,602)
Payments for repurchase of common stock related to shares withheld for tax in connection with vesting of stock awards (20,417) (20,754)
Proceeds from exercise of stock options 23,101 2,653
Payments for debt issuance costs (780) 0
Net cash used in financing activities (93,373) (78,703)
Effect of exchange rate changes on cash and cash equivalents (611) 463
Net increase in cash and cash equivalents 32,226 31,541
Cash and cash equivalents    
Beginning of period 174,668 169,732
End of period 206,894 201,273
Supplemental disclosure    
Cash paid for interest 185 197
Cash paid for taxes, net of refunds 4,387 19,065
Cash paid for amounts included in the measurement of lease liabilities, net of tenant improvement reimbursements received 7,088 3,460
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment in accounts payable and accrued expenses 3,635 2,155
Right-of-use assets obtained in exchange for new operating lease liabilities 1,829 1,491
Excise tax on share repurchases, accrued but not paid $ 258 $ 187