CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Current assets
Cash and cash equivalents	$ 308,517	$ 295,649
Marketable securities	55	67
Accounts receivable, net	196,679	188,291
Inventories	123,917	114,834
Prepaid expenses and other current assets	45,988	50,612
Total current assets	675,156	649,453
Property, plant and equipment, net	126,947	117,665
Long-term marketable securities	3,410	3,101
Long-term deferred tax assets	4,765	4,979
Goodwill	512,989	501,536
Intangible assets, net	219,866	218,325
Other assets	71,599	64,066
Total assets	1,614,732	1,559,125
Current liabilities
Current portion of long-term debt	414	827
Accounts payable	67,811	61,758
Deferred revenue	35,661	31,357
Accrued warranty and retrofit costs	8,228	8,201
Accrued compensation and benefits	31,693	43,267
Accrued restructuring costs	106	181
Accrued income taxes payable	15,972	10,094
Accrued expenses and other current liabilities	65,885	55,433
Total current liabilities	225,770	211,118
Long-term debt	49,629	49,588
Long-term tax reserves	19,458	19,168
Long-term deferred tax liabilities	15,132	17,798
Long-term pension liabilities	6,741	6,406
Long-term operating lease liabilities	34,173	31,855
Other long-term liabilities	11,675	9,578
Total liabilities	362,578	345,511
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, 87,672,132 shares issued and 74,210,263 shares outstanding at December 31, 2020, 87,293,710 shares issued and 73,831,841 shares outstanding at September 30, 2020	877	873
Additional paid-in capital	1,949,556	1,942,850
Accumulated other comprehensive income	35,145	21,919
Treasury stock, at cost- 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(532,468)	(551,072)
Total stockholders' equity	1,252,154	1,213,614
Total liabilities and stockholders' equity	$ 1,614,732	$ 1,559,125