CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net loss	$ (152,604)	$ (16,162)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	44,214	42,140
Impairment of goodwill and intangible assets	115,975
Non-cash write-offs of assets	6,966
Stock-based compensation	8,804	6,096
Contingent consideration adjustment		(17,145)
Amortization and accretion on marketable securities	(2,084)	(5,284)
Deferred income taxes	(9,456)	(20,843)
Purchase accounting impact on inventory		5,781
Loss on disposals of property, plant and equipment	260	31
Changes in operating assets and liabilities:
Accounts receivable	2,922	23,925
Inventories	7,975	(11,504)
Accounts payable	936	(5,677)
Deferred revenue	3,379	3,625
Accrued warranty and retrofit costs	(714)	622
Accrued compensation and tax withholdings	(6,153)	(21,797)
Accrued restructuring costs	1,454	820
Other assets and liabilities	12,913	(23,798)
Net cash provided by (used in) operating activities	34,787	(39,170)
Cash flows from investing activities
Purchases of property, plant and equipment	(18,746)	(21,705)
Purchases of marketable securities	(345,447)	(233,584)
Sales and maturities of marketable securities	190,504	728,171
Net Investment hedge settlement	1,476	29,313
Acquisitions, net of cash acquired		(387,665)
Net cash provided by (used in) investing activities	(172,213)	114,530
Cash flows from financing activities
Payments of finance leases	(386)	(230)
Withholding tax payments on net share settlements on equity awards		(4,906)
Share repurchases	(186,834)	(500,000)
Net cash used in financing activities	(187,220)	(505,136)
Effects of exchange rate changes on cash and cash equivalents	4,721	60,355
Net increase (decrease) in cash, cash equivalents and restricted cash	(319,925)	(369,421)
Cash, cash equivalents and restricted cash, beginning of period	684,045	1,041,296
Cash, cash equivalents and restricted cash, end of period	364,120	671,875
Supplemental disclosures:
Cash paid for income taxes, net	$ 5,008	$ 35,286