CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Current assets
Cash and cash equivalents	$ 702,923	$ 678,910
Short-term marketable securities	281,212	338,873
Accounts receivable, net of allowance for expected credit losses ($7,465 and $8,057, respectively)	155,926	156,535
Inventories	127,184	128,198
Derivative asset		13,036
Short-term restricted cash	4,792	4,650
Prepaid expenses and other current assets	110,764	98,754
Total current assets	1,382,801	1,418,956
Property, plant and equipment, net	210,628	205,744
Long-term marketable securities	61,962	111,338
Long-term deferred tax assets	1,341	571
Goodwill	800,166	784,339
Intangible assets, net	290,229	294,301
Other assets	77,187	70,471
Total assets	2,824,314	2,885,720
Current liabilities
Accounts payable	40,237	35,796
Deferred revenue	34,813	34,614
Accrued warranty and retrofit costs	10,047	10,223
Accrued compensation and benefits	33,368	33,911
Accrued customer deposits	23,432	17,707
Accrued VAT payable	24,033	20,595
Accrued income taxes payable	13,228	7,378
Accrued expenses and other current liabilities	56,462	50,704
Total current liabilities	235,620	210,928
Long-term tax accruals	369	380
Long-term deferred tax liabilities	65,865	67,301
Long-term operating lease liabilities	66,479	60,436
Other long-term liabilities	12,317	12,175
Total liabilities	380,650	351,220
Stockholders' equity
Preferred stock, $0.01 par value - 1,000,000 shares authorized, no shares issued or outstanding
Common stock, $0.01 par value - 125,000,000 shares authorized, 69,180,281 shares issued and 55,718,412 shares outstanding at December 31, 2023, 71,294,247 shares issued and 57,832,378 shares outstanding at September 30, 2023	692	713
Additional paid-in capital	1,045,427	1,156,160
Accumulated other comprehensive loss	(26,784)	(62,426)
Treasury stock, at cost - 13,461,869 shares at December 31, 2023 and September 30, 2023	(200,956)	(200,956)
Retained earnings	1,625,285	1,641,009
Total stockholders' equity	2,443,664	2,534,500
Total liabilities and stockholders' equity	$ 2,824,314	$ 2,885,720