CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Current assets
Cash and cash equivalents	$ 194,016	$ 101,622
Marketable securities	40,655	28
Accounts receivable, net	141,501	120,828
Inventories	126,594	106,395
Prepaid expenses and other current assets	26,803	23,138
Total current assets	529,569	352,011
Property, plant and equipment, net	60,700	58,462
Long-term marketable securities	10,508	2,642
Long-term deferred tax assets	47,572	1,692
Goodwill	275,228	233,638
Intangible assets, net	102,182	83,520
Equity method investment	35,134	28,593
Other assets	5,648	6,070
Total assets	1,066,541	766,628
Current liabilities
Current portion of long term debt	2,000
Accounts payable	65,110	49,100
Deferred revenue	22,067	24,292
Accrued warranty and retrofit costs	8,289	8,054
Accrued compensation and benefits	23,105	27,065
Accrued restructuring costs	416	1,708
Accrued income taxes payable	8,713	11,417
Accrued expenses and other current liabilities	28,716	25,142
Total current liabilities	158,416	146,778
Long-term debt	194,870
Long-term tax reserves	1,428	1,687
Long-term deferred tax liabilities	6,308	3,748
Long-term pension liabilities	2,081	1,979
Other long-term liabilities	5,605	4,792
Total liabilities	368,708	158,984
Commitments and contingencies (Note 16)
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, 84,001,725 shares issued and 70,539,856 shares outstanding at March 31, 2018, 83,294,848 shares issued and 69,832,979 shares outstanding at September 30, 2017	840	833
Additional paid-in capital	1,886,435	1,874,918
Accumulated other comprehensive income	24,497	15,213
Treasury stock, at cost- 13,461,869 shares	(200,956)	(200,956)
Accumulated deficit	(1,012,983)	(1,082,364)
Total stockholders' equity	697,833	607,644
Total liabilities and stockholders' equity	$ 1,066,541	$ 766,628