CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Current assets
Cash and cash equivalents	$ 295,649	$ 301,642
Marketable securities	67	34,124
Accounts receivable, net	188,291	165,602
Inventories	114,834	99,445
Prepaid expenses and other current assets	50,612	46,332
Total current assets	649,453	647,145
Property, plant and equipment, net	117,665	100,669
Long-term marketable securities	3,101	2,845
Long-term deferred tax assets	4,979	5,064
Goodwill	501,536	488,602
Intangible assets, net	218,325	251,168
Other assets	64,066	20,506
Total assets	1,559,125	1,515,999
Current liabilities
Current portion of long-term debt	827	829
Accounts payable	61,758	58,919
Deferred revenue	31,357	29,435
Accrued warranty and retrofit costs	8,201	7,175
Accrued compensation and benefits	43,267	31,375
Accrued restructuring costs	181	1,040
Accrued income taxes payable	10,094	99,263
Accrued expenses and other current liabilities	55,433	44,234
Total current liabilities	211,118	272,270
Long-term debt	49,588	50,315
Long-term tax reserves	19,168	18,274
Long-term deferred tax liabilities	17,798	20,636
Long-term pension liabilities	6,406	5,338
Long-term operating lease liabilities	31,855
Other long-term liabilities	9,578	10,212
Total liabilities	345,511	377,045
Commitments and contingencies (Note 22)
Stockholders' Equity
Preferred stock, $0.01 par value - 1,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $0.01 par value - 125,000,000 shares authorized, 87,293,710 shares issued and 73,831,841 shares outstanding at September 30, 2020, 85,759,700 shares issued and 72,297,831 shares outstanding at September 30, 2019	873	857
Additional paid-in capital	1,942,850	1,921,954
Accumulated other comprehensive income	21,919	3,511
Treasury stock, at cost- 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(551,072)	(586,412)
Total stockholders' equity	1,213,614	1,138,954
Total liabilities and stockholders' equity	$ 1,559,125	$ 1,515,999