CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 242,461	$ 235,266
Short-term investments	177,442	160,051
Accounts receivable, net	141,297	128,219
Inventory, net	58,026	53,162
Other current assets	26,400	20,297
Total current assets	645,626	596,995
Long-term investments	134,951	145,623
Property, plant, and equipment, net	150,650	149,735
Goodwill and purchased intangibles, net	15,640	15,827
Deferred tax and other assets	25,874	25,257
Total assets	972,741	933,437
Current liabilities:
Accounts payable	40,680	39,133
Accrued liabilities	66,057	70,034
Total current liabilities	106,737	109,167
Long term debt, net of issuance costs	490,696	489,609
Long-term income taxes payable	11,726	11,968
Other long-term liabilities	13,462	10,294
Total liabilities	622,621	621,038
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock	802	793
Additional paid-in capital	801,213	769,489
Accumulated other comprehensive income	4,438	3,759
Retained earnings	305,425	257,291
Total stockholders' equity before treasury stock	1,111,878	1,031,332
Less: Treasury stock, at cost	(761,758)	(718,933)
Total stockholders' equity	350,120	312,399
Total liabilities and stockholders' equity	$ 972,741	$ 933,437