CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Current assets
Cash and cash equivalents	$ 242,274	$ 301,642
Marketable securities	162	34,124
Accounts receivable, net	179,014	165,602
Inventories	107,699	99,445
Prepaid expenses and other current assets	43,379	46,332
Total current assets	572,528	647,145
Property, plant and equipment, net	108,744	100,669
Long-term marketable securities	2,555	2,845
Long-term deferred tax assets	5,080	5,064
Goodwill	498,502	488,602
Intangible assets, net	236,095	251,168
Other assets	55,827	20,506
Total assets	1,479,331	1,515,999
Current liabilities
Current portion of long-term debt	828	829
Accounts payable	63,958	58,919
Deferred revenue	29,090	29,435
Accrued warranty and retrofit costs	7,910	7,175
Accrued compensation and benefits	31,220	31,375
Accrued restructuring costs	935	1,040
Accrued income taxes payable	9,134	99,263
Accrued expenses and other current liabilities	53,960	44,234
Total current liabilities	197,035	272,270
Long-term debt	49,951	50,315
Long-term tax reserves	18,841	18,274
Long-term deferred tax liabilities	12,190	20,636
Long-term pension liabilities	5,594	5,338
Long-term operating lease liabilities	27,233
Other long-term liabilities	7,354	10,212
Total liabilities	318,198	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, 87,214,622 shares issued and 73,752,753 shares outstanding at March 31, 2020, 85,759,700 shares issued and 72,297,831 shares outstanding at September 30, 2019	872	857
Additional paid-in capital	1,932,893	1,921,954
Accumulated other comprehensive income	7,299	3,511
Treasury stock, at cost- 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(578,975)	(586,412)
Total stockholders' equity	1,161,133	1,138,954
Total liabilities and stockholders' equity	$ 1,479,331	$ 1,515,999