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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities      
Net (loss) income $ (164,170) $ (14,257) $ 2,132,859
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:      
Depreciation and amortization 90,744 85,584 53,702
Impairment of goodwill and intangible assets 115,975 0 0
Property, plant and equipment and other asset write-offs 4,430 0  
Inventory write-downs 3,290    
Other non-cash charges related to restructuring and transformation 4,317 0 0
Stock-based compensation 14,467 9,376 10,666
Contingent consideration adjustment 0 (18,549) 600
Amortization and accretion on marketable securities (6,032) (7,870) (1,894)
Deferred income taxes (16,072) (28,654) 24,469
Loss on extinguishment of debt 0 0 632
Purchase accounting impact on inventory 0 9,664 0
Loss (gain) on disposals of property, plant and equipment 296 43 (21)
Gain on divestiture, net of tax 0 0 (2,130,265)
Fees paid stemming from divestiture 0 0 (52,461)
Taxes paid stemming from divestiture 0 0 (431,600)
Changes in operating assets and liabilities:      
Accounts receivable (11,589) 33,992 (31,397)
Inventories 16,350 8,253 (66,629)
Accounts payable 9,196 (14,710) (3,926)
Deferred revenue (3,558) (7,564) 16,599
Accrued warranty and retrofit costs (684) 4,560 303
Accrued compensation and tax withholdings (4,184) (19,055) 11,404
Other assets and liabilities (2,487) (33,655) 913
Net cash provided by (used in) operating activities 50,289 7,158 (466,046)
Cash flows from investing activities      
Purchases of property, plant and equipment (37,392) (39,436) (73,435)
Purchases of technology intangibles 0 0 (4,000)
Purchases of marketable securities and other investments (405,575) (236,194) (1,975,599)
Sales and maturities of marketable securities 666,230 1,064,209 705,384
Proceeds from divestiture, net of cash transferred 0 0 2,939,116
Net investment hedge settlement 1,476 29,313 0
Acquisitions, net of cash acquired 0 (386,508) (125,876)
Net cash provided by investing activities 224,739 431,384 1,465,590
Cash flows from financing activities      
Proceeds from issuance of common stock 3,279 3,621 5,245
Principal payments on debt 0 0 (49,725)
Payments of finance leases (783) (578) (388)
Payment for contingent consideration related to acquisition 0 0 (10,400)
Withholding tax payments on net share settlements on equity awards 0 (4,988) 0
Share repurchases (661,703) (838,514) 0
Common stock dividends 0 0 (7,494)
Net cash used in financing activities (659,207) (840,459) (62,762)
Effects of exchange rate changes on cash and cash equivalents 21,124 44,666 (180,819)
Net (decrease) increase in cash, cash equivalents and restricted cash (363,055) (357,251) 755,963
Cash, cash equivalents and restricted cash, beginning of period 684,045 1,041,296 285,333
Cash, cash equivalents and restricted cash, end of period 320,990 684,045 1,041,296
Supplemental disclosures:      
Cash paid for interest 0 0 469
Cash paid for income taxes, net 2,704 43,073 452,461
Purchases of property, plant and equipment included in accounts payable and accrued expenses 2,767 2,725 10,196
Cash and cash equivalents of continuing operations 310,929 678,910 658,274
Short-term restricted cash included in prepaid expenses and other current assets 2,069 4,650 382,596
Long-term restricted cash included in other assets 7,992 485 426
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 320,990 $ 684,045 $ 1,041,296