CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Current assets
Cash and cash equivalents	$ 215,168	$ 227,427
Marketable securities	51	81
Accounts receivable, net	126,001	119,877
Inventories	70,143	60,398
Prepaid expenses and other current assets	60,833	58,198
Current assets held for sale	324,533	311,385
Total current assets	796,729	777,366
Property, plant and equipment, net	147,261	130,719
Long-term marketable securities	3,724	3,598
Long-term deferred tax assets	13,845	10,043
Goodwill	468,585	469,356
Intangible assets, net	178,589	186,534
Other assets	60,042	58,068
Non-current assets held for sale	186,162	183,828
Total assets	1,854,937	1,819,512
Current liabilities
Accounts payable	46,869	42,360
Deferred revenue	28,483	25,724
Accrued warranty and retrofit costs	2,342	2,330
Accrued compensation and benefits	24,872	33,183
Accrued restructuring costs	142	304
Accrued income taxes payable	14,037	8,711
Accrued expenses and other current liabilities	104,306	103,537
Current liabilities held for sale	120,749	128,939
Total current liabilities	341,800	345,088
Long-term debt	49,702	49,677
Long-term tax reserves	1,995	1,973
Long-term deferred tax liabilities	13,141	13,030
Long-term pension liabilities	726	705
Long-term operating lease liabilities	43,802	45,088
Other long-term liabilities	4,372	6,173
Non-current liabilities held for sale	31,976	32,444
Total liabilities	487,514	494,178
Commitments and contingencies (Note 21)
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, 87,808,922 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	884	878
Additional paid-in capital	1,977,571	1,976,112
Accumulated other comprehensive income	24,149	19,351
Treasury stock, at cost - 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(434,225)	(470,051)
Total stockholders' equity	1,367,423	1,325,334
Total liabilities and stockholders' equity	$ 1,854,937	$ 1,819,512