CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Current assets
Cash and cash equivalents	$ 101,622	$ 85,086
Marketable securities	28	39
Accounts receivable, net	120,828	106,372
Inventories	106,395	92,572
Prepaid expenses and other current assets	23,138	15,265
Total current assets	352,011	299,334
Property, plant and equipment, net	58,462	54,885
Long-term marketable securities	2,642	6,096
Long-term deferred tax assets	1,692	1,982
Goodwill	233,638	202,138
Intangible assets, net	83,520	81,843
Equity method investments	28,593	27,273
Other assets	6,070	12,354
Total assets	766,628	685,905
Current liabilities
Accounts payable	49,100	41,128
Deferred revenue	24,292	14,966
Accrued warranty and retrofit costs	8,054	6,324
Accrued compensation and benefits	27,065	21,254
Accrued restructuring costs	1,708	5,939
Accrued income taxes payable	11,417	7,554
Accrued expenses and other current liabilities	25,142	22,628
Total current liabilities	146,778	119,793
Long-term tax reserves	1,687	2,681
Long-term deferred tax liabilities	3,748	2,913
Long-term pension liabilities	1,979	2,557
Other long-term liabilities	4,792	4,271
Total liabilities	158,984	132,215
Commitments and contingencies (Note 20)
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, 83,294,848 shares issued and 69,832,979 shares outstanding at September 30, 2017, 82,220,270 shares issued and 68,758,401 shares outstanding at September 30, 2016	833	821
Additional paid-in capital	1,874,918	1,855,703
Accumulated other comprehensive income	15,213	15,166
Treasury stock, at cost- 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(1,082,364)	(1,117,044)
Total stockholders' equity	607,644	553,690
Total liabilities and stockholders' equity	$ 766,628	$ 685,905