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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities    
Net loss $ (106,602) $ (159,186)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 46,775 66,899
Impairment of goodwill and intangible assets 0 115,975
Long Lived Assets To Be Sold 93,025 0
Inventory write-downs and other asset write-offs 3,866 10,745
Stock-based compensation 15,887 12,622
Amortization and accretion on marketable securities (1,318) (4,706)
Deferred income taxes (20,025) (12,478)
Loss on disposals of property, plant and equipment 759 297
Changes in operating assets and liabilities:    
Accounts receivable 38,799 (10,923)
Inventories (10,069) 14,107
Accounts payable (702) 2,831
Deferred revenue 7,156 (1,635)
Accrued warranty and retrofit costs 36 (1,080)
Accrued compensation and tax withholdings 3,010 (2,825)
Accrued restructuring costs (51) 1,125
Other assets and liabilities (535) 383
Net cash provided by operating activities 70,011 32,151
Cash flows from investing activities    
Purchases of property, plant and equipment (25,997) (28,013)
Purchases of marketable securities (312,990) (378,275)
Sales and maturities of marketable securities 242,527 431,544
Proceeds from other investment 2,130 0
Net investment hedge settlement 3,043 1,476
Net cash (used in) provided by investing activities (91,287) 26,732
Cash flows from financing activities    
Proceeds from issuance of common stock 1,553 1,678
Payments of finance leases (585) (584)
Share repurchases 0 (412,755)
Excise tax payment for settled share repurchases (11,376) 0
Net cash used in financing activities (10,408) (411,661)
Effects of exchange rate changes on cash, cash equivalents and restricted cash 4,510 15,596
Net decrease in cash, cash equivalents and restricted cash (27,174) (337,182)
Cash, cash equivalents and restricted cash, beginning of period 320,990 684,045
Cash, cash equivalents and restricted cash, end of period 293,816 346,863
Supplemental disclosures:    
Cash paid for income taxes, net 2,243 6,710
Purchases of property, plant and equipment included in accounts payable and accrued expenses $ 4,652 $ 2,575