CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Current assets
Cash and cash equivalents	$ 335,319	$ 301,642
Marketable securities	11,233	34,124
Accounts receivable, net	165,176	165,602
Inventories	105,181	99,445
Prepaid expenses and other current assets	46,560	46,332
Total current assets	663,469	647,145
Property, plant and equipment, net	105,296	100,669
Long-term marketable securities	3,039	2,845
Long-term deferred tax assets	6,004	5,064
Goodwill	490,370	488,602
Intangible assets, net	242,248	251,168
Other assets	48,532	20,506
Total assets	1,558,958	1,515,999
Current liabilities
Current portion of long-term debt	827	829
Accounts payable	65,306	58,919
Deferred revenue	29,042	29,435
Accrued warranty and retrofit costs	7,493	7,175
Accrued compensation and benefits	25,810	31,375
Accrued restructuring costs	844	1,040
Accrued income taxes payable	100,451	99,263
Accrued expenses and other current liabilities	53,179	44,234
Total current liabilities	282,952	272,270
Long-term debt	49,918	50,315
Long-term tax reserves	18,543	18,274
Long-term deferred tax liabilities	13,636	20,636
Long-term pension liabilities	5,397	5,338
Long-term operating lease liabilities	20,526
Other long-term liabilities	9,291	10,212
Total liabilities	400,263	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, 87,080,017 shares issued and 73,618,148 shares outstanding at December 31, 2019, 85,759,700 shares issued and 72,297,831 shares outstanding at September 30, 2019	871	857
Additional paid-in capital	1,926,350	1,921,954
Accumulated other comprehensive income	13,154	3,511
Treasury stock, at cost- 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(580,724)	(586,412)
Total stockholders' equity	1,158,695	1,138,954
Total liabilities and stockholders' equity	$ 1,558,958	$ 1,515,999