CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net income / (loss)	$ (11,235)	$ 43,320
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,181	12,883
Stock-based compensation	2,105	7,891
Amortization of premium on marketable securities and deferred financing costs	(3,104)	56
Deferred income taxes	(6,325)	(3,084)
Purchase accounting impact on inventory	2,869
(Gain) loss on disposals of property, plant and equipment	17	(95)
Changes in operating assets and liabilities, net of acquisitions and divestiture:
Accounts receivable	(12,141)	1,121
Inventories	(5,923)	(32,150)
Accounts payable	4,952	(2,219)
Deferred revenue	(59)	4,056
Accrued warranty and retrofit costs	504	(103)
Accrued compensation and tax withholdings	(14,015)	(5,371)
Accrued restructuring costs	1,139
Other current assets and liabilities	(5,985)	(10,687)
Net cash (used in) provided by operating activities	(27,020)	15,618
Cash flows from investing activities
Purchases of property, plant and equipment	(12,842)	(18,409)
Purchases of marketable securities	(166,374)	(46)
Sales and maturities of marketable securities	607,205	30
Acquisitions, net of cash acquired	(371,633)
Net cash provided by (used in) investing activities	56,356	(18,425)
Cash flows from financing activities
Principal payments on debt		(186)
Common stock dividends paid		(7,494)
Payments of finance leases	(91)
Stock repurchase	(500,000)
Withholding tax payments on net share settlements on equity awards	(4,629)
Net cash used in financing activities	(504,720)	(7,680)
Effects of exchange rate changes on cash and cash equivalents	49,941	(1,804)
Net increase (decrease) in cash, cash equivalents and restricted cash	(425,443)	(12,291)
Cash, cash equivalents and restricted cash, beginning of period	1,041,296	285,333
Cash, cash equivalents and restricted cash, end of period	615,854	273,042
Supplemental disclosures:
Cash paid for interest		333
Cash paid for income taxes, net	$ 7,291	$ 10,911