Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net loss	$ (6,582)	$ (159,186)	$ (17,632)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization		66,899	63,443
Impairment of goodwill and intangible assets	0	115,975	0
Non-cash write-offs of assets		10,745	0
Stock-based compensation		12,622	10,091
Contingent consideration adjustment	0	0	(18,549)
Amortization and accretion on marketable securities		(4,706)	(6,942)
Deferred income taxes		(12,478)	(25,149)
Purchase accounting impact on inventory		0	8,737
Loss on disposals of property, plant and equipment		297	37
Changes in operating assets and liabilities:
Accounts receivable		(10,923)	29,028
Inventories		11,433	(4,104)
Accounts payable		2,831	(13,193)
Deferred revenue		(1,635)	2,496
Accrued warranty and retrofit costs		(1,080)	1,412
Accrued compensation and tax withholdings		(2,825)	(15,830)
Accrued restructuring costs		1,125	311
Other assets and liabilities		7,484	(36,578)
Net cash provided by (used in) operating activities		36,578	(22,422)
Cash flows from investing activities
Purchases of property, plant and equipment		(25,339)	(29,218)
Purchases of marketable securities		(378,275)	(236,194)
Sales and maturities of marketable securities	241,000	431,544	951,504
Net investment hedge settlement		1,476	29,313
Acquisitions, net of cash acquired		0	(386,508)
Net cash provided by investing activities		29,406	328,897
Cash flows from financing activities
Payments of finance leases		(584)	(181)
Withholding tax payments on net share settlements on equity awards		0	(4,924)
Proceeds from Employee Stock Purchase Plan		1,678	0
Share repurchases		(412,755)	(672,116)
Net cash used in financing activities		(411,661)	(677,221)
Effects of exchange rate changes on cash and cash equivalents		8,495	65,610
Net decrease in cash, cash equivalents and restricted cash		(337,182)	(305,136)
Cash, cash equivalents and restricted cash, beginning of period		684,045	1,041,296
Cash, cash equivalents and restricted cash, end of period	346,863	346,863	736,160
Supplemental disclosures:
Cash paid for income taxes, net		6,710	41,064
Purchases of property, plant and equipment included in accounts payable and accrued expenses		2,203	2,437
Cash and cash equivalents of continuing operations	336,543	336,543
Short-term restricted cash included in prepaid expenses and other current assets	2,771	2,771
Long-term restricted cash included in other assets	7,549	7,549
Cash, cash equivalents and restricted cash, end of period	$ 346,863	$ 346,863	$ 736,160