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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities                  
Net loss $ (10,992) $ (14,262) $ (58,653) $ (151,704) $ (106,640) $ (158,258) $ (55,763) $ (164,897) $ (14,636)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:                  
Depreciation and amortization             61,209 90,744 85,584
Impairment of goodwill and intangible assets             0 115,975 0
Loss on assets held for sale     31,848 0 92,706 0 93,118 0 0
Property, plant and equipment and other asset write-offs             3,478 4,430 0
Inventory write-downs             0 3,290 0
Other non-cash charges related to restructuring and transformation             0 4,317 0
Stock-based compensation         16,716 12,622 20,881 14,467 9,376
Contingent consideration adjustment             0 0 (18,549)
Amortization and accretion on marketable securities             (1,578) (6,032) (7,870)
Deferred income taxes 657 (7,396) (4,183) (9,443) (20,385) (12,492) (27,038) (15,886) (28,740)
Purchase accounting impact on inventory             0 0 9,664
Loss on disposals of property, plant and equipment             711 296 43
Changes in operating assets and liabilities:                  
Accounts receivable 4,850 2,359 6,713 2,451 38,799 (11,394) 21,039 (12,067) 34,456
Inventories (7,622) 4,485 (5,780) 7,794 (9,998) 13,663 (2,671) 15,896 8,253
Accounts payable     1,981 936 (365) 2,831 1,037 9,196 (14,710)
Deferred revenue             641 (3,558) (7,564)
Accrued warranty and retrofit costs             (435) (684) 4,560
Accrued compensation and tax withholdings (637) (979) (1,956) (7,831) 3,604 (2,825) 7,427 (2,754) (19,055)
Long term income taxes receivable             (45,600) 0 0
Other assets and liabilities 11,942 3,306 11,457 1,306 (1,651) 303 (4,275) (2,990) (34,978)
Net cash provided by operating activities 29,798 13,617 44,201 22,296 70,011 32,069 72,181 49,743 5,834
Cash flows from investing activities                  
Purchases of property, plant and equipment (7,750) (11,291)         (33,857) (37,392) (39,436)
Purchases of marketable securities and other investments             (451,409) (405,575) (236,194)
Sales and maturities of marketable securities             389,452 666,230 1,064,209
Proceeds from other investment             2,130 0 0
Net investment hedge settlement             3,223 1,476 29,313
Acquisitions, net of cash acquired             0 0 (386,508)
Net cash (used in) provided by investing activities 77,086 99,025         (90,461) 224,739 431,384
Cash flows from financing activities                  
Proceeds from issuance of common stock             2,770 3,279 3,621
Payments of finance leases             (985) (783) (578)
Withholding tax payments on net share settlements on equity awards             0 0 (4,988)
Share repurchases             0 (661,703) (838,514)
Excise tax payment for settled share repurchases             (11,376) 0 0
Net cash used in financing activities             (9,591) (659,207) (840,459)
Effects of exchange rate changes on cash, cash equivalents and restricted cash (8,311) 24,687 (4,459) 16,330 4,510 15,678 3,566 21,670 45,990
Net decrease in cash, cash equivalents and restricted cash             (24,305) (363,055) (357,251)
Cash, cash equivalents and restricted cash, beginning of period $ 320,990 $ 684,045 $ 320,990 $ 684,045 $ 320,990 $ 684,045 320,990 684,045 1,041,296
Cash, cash equivalents and restricted cash, end of period             296,685 320,990 684,045
Supplemental disclosures:                  
Cash paid for income taxes, net             6,568 2,704 43,073
Purchases of property, plant and equipment included in accounts payable and accrued expenses             5,546 2,767 2,725
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets                  
Cash and cash equivalents of continuing operations             279,783 280,030 649,481
Cash included in current assets held for sale             13,206 30,899 29,429
Short-term restricted cash included in prepaid expenses and other current assets             2,359 2,069 4,650
Long-term restricted cash included in other assets             1,337 7,992 485
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows             $ 296,685 $ 320,990 $ 684,045