CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 244,455	$ 235,266
Short-term investments	178,485	160,051
Accounts receivable, net	136,779	128,219
Inventory, net	52,686	53,162
Other current assets	27,476	20,297
Total current assets	639,881	596,995
Long-term investments	130,695	145,623
Property, plant, and equipment, net	152,263	149,735
Goodwill and purchased intangibles, net	15,702	15,827
Deferred tax and other assets	21,986	25,257
Total assets	960,527	933,437
Current liabilities:
Accounts payable	42,779	39,133
Accrued liabilities	71,452	70,034
Total current liabilities	114,231	109,167
Long term debt, net of issuance costs	490,334	489,609
Long-term income taxes payable	12,874	11,968
Other long-term liabilities	12,392	10,294
Total liabilities	629,831	621,038
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock	802	793
Additional paid-in capital	791,582	769,489
Accumulated other comprehensive income	4,160	3,759
Retained earnings	288,181	257,291
Total stockholders' equity before treasury stock	1,084,725	1,031,332
Less: Treasury stock, at cost	(754,029)	(718,933)
Total stockholders' equity	330,696	312,399
Total liabilities and stockholders' equity	$ 960,527	$ 933,437