CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Current assets
Cash and cash equivalents	$ 256,633	$ 301,642
Marketable securities	136	34,124
Accounts receivable, net	183,167	165,602
Inventories	117,686	99,445
Prepaid expenses and other current assets	44,389	46,332
Total current assets	602,011	647,145
Property, plant and equipment, net	111,416	100,669
Long-term marketable securities	2,939	2,845
Long-term deferred tax assets	3,489	5,064
Goodwill	500,062	488,602
Intangible assets, net	226,623	251,168
Other assets	57,377	20,506
Total assets	1,503,917	1,515,999
Current liabilities
Current portion of long-term debt	828	829
Accounts payable	70,344	58,919
Deferred revenue	31,162	29,435
Accrued warranty and retrofit costs	7,881	7,175
Accrued compensation and benefits	33,847	31,375
Accrued restructuring costs	437	1,040
Accrued income taxes payable	16,253	99,263
Accrued expenses and other current liabilities	45,053	44,234
Total current liabilities	205,805	272,270
Long-term debt	49,563	50,315
Long-term tax reserves	19,609	18,274
Long-term deferred tax liabilities	10,613	20,636
Long-term pension liabilities	5,724	5,338
Long-term operating lease liabilities	29,280
Other long-term liabilities	8,470	10,212
Total liabilities	329,064	377,045
Commitments and contingencies (Note 17)
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, 87,222,115 shares issued and 73,760,246 shares outstanding at June 30, 2020, 85,759,700 shares issued and 72,297,831 shares outstanding at September 30, 2019	872	857
Additional paid-in capital	1,936,619	1,921,954
Accumulated other comprehensive income	10,977	3,511
Treasury stock, at cost- 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(572,659)	(586,412)
Total stockholders' equity	1,174,853	1,138,954
Total liabilities and stockholders' equity	$ 1,503,917	$ 1,515,999