CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Current assets
Cash and cash equivalents	$ 227,427	$ 250,649
Marketable securities	81	51
Accounts receivable, net	119,877	94,791
Inventories	60,398	37,125
Prepaid expenses and other current assets	58,198	43,974
Current assets held for sale	311,385	222,863
Total current assets	777,366	649,453
Property, plant and equipment, net	130,719	88,735
Long-term marketable securities	3,598	3,101
Long-term deferred tax assets	10,043	3,976
Goodwill	469,356	453,177
Intangible assets, net	186,534	212,323
Other assets	58,068	49,782
Non-current assets held for sale	183,828	98,718
Total assets	1,819,512	1,559,265
Current liabilities
Current portion of long-term debt		827
Accounts payable	42,360	25,689
Deferred revenue	25,724	25,776
Accrued warranty and retrofit costs	2,330	2,211
Accrued compensation and benefits	33,183	28,669
Accrued restructuring costs	304	122
Accrued income taxes payable	8,711	1,975
Accrued expenses and other current liabilities	103,537	43,017
Current liabilities held for sale	128,939	82,832
Total current liabilities	345,088	211,118
Long-term debt	49,677	49,588
Long-term tax reserves	1,973	18,471
Long-term deferred tax liabilities	13,030	17,797
Long-term pension liabilities	705	895
Long-term operating lease liabilities	45,088	18,905
Other long-term liabilities	6,173	1,302
Non-current liabilities held for sale	32,444	27,575
Total liabilities	494,178	345,651
Commitments and contingencies (Note 21)
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, 87,808,922 shares issued and 74,347,053 shares outstanding at September 30, 2021, 87,293,710 shares issued and 73,831,841 shares outstanding at September 30, 2020	878	873
Additional paid-in capital	1,976,112	1,942,850
Accumulated other comprehensive income	19,351	21,919
Treasury stock, at cost - 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(470,051)	(551,072)
Total stockholders' equity	1,325,334	1,213,614
Total liabilities and stockholders' equity	$ 1,819,512	$ 1,559,265