CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Current assets
Cash and cash equivalents	$ 301,642	$ 197,708
Marketable securities	34,124	46,281
Accounts receivable, net	165,602	125,192
Inventories	99,445	96,986
Prepaid expenses and other current assets	46,332	31,741
Current assets held for sale		66,148
Total current assets	647,145	564,056
Property, plant and equipment, net	100,669	59,988
Long-term marketable securities	2,845	7,237
Long-term deferred tax assets	5,064	43,798
Goodwill	488,602	255,876
Intangible assets, net	251,168	99,956
Other assets	20,506	5,294
Non-current assets held for sale		59,052
Total assets	1,515,999	1,095,257
Current liabilities
Current portion of long-term debt	829	2,000
Accounts payable	58,919	44,724
Deferred revenue	29,435	25,884
Accrued warranty and retrofit costs	7,175	6,340
Accrued compensation and benefits	31,375	29,322
Accrued restructuring costs	1,040	659
Accrued income taxes payable	99,263	6,746
Accrued expenses and other current liabilities	44,234	30,405
Current liabilities held for sale		18,537
Total current liabilities	272,270	164,617
Long-term debt	50,315	194,071
Long-term tax reserves	18,274	1,102
Long-term deferred tax liabilities	20,636	7,135
Long-term pension liabilities	5,338	4,255
Other long-term liabilities	10,212	5,547
Non-current liabilities held for sale		698
Total liabilities	377,045	377,425
Commitments and contingencies (Note 23)
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, 85,759,700 shares issued and 72,297,831 shares outstanding at September 30, 2019, 84,164,130 shares issued and 70,702,261 shares outstanding at September 30, 2018	857	841
Additional paid-in capital	1,921,954	1,898,434
Accumulated other comprehensive income	3,511	13,587
Treasury stock, at cost- 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(586,412)	(994,074)
Total stockholders' equity	1,138,954	717,832
Total liabilities and stockholders' equity	$ 1,515,999	$ 1,095,257