CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 227,473	$ 235,266
Short-term investments	171,899	160,051
Accounts receivable, net	133,155	128,219
Inventory, net	53,912	53,162
Other current assets	26,151	20,297
Total current assets	612,590	596,995
Long-term investments	132,270	145,623
Property, plant, and equipment, net	151,863	149,735
Goodwill and purchased intangibles, net	15,765	15,827
Deferred tax and other assets	19,450	25,257
Total assets	931,938	933,437
Current liabilities:
Accounts payable	46,817	39,133
Accrued liabilities	60,670	70,034
Total current liabilities	107,487	109,167
Long term debt, net of issuance costs	489,971	489,609
Long-term income taxes payable	12,464	11,968
Other long-term liabilities	11,448	10,294
Total liabilities	621,370	621,038
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock	799	793
Additional paid-in capital	778,209	769,489
Accumulated other comprehensive income	5,216	3,759
Retained earnings	272,708	257,291
Total stockholders' equity before treasury stock	1,056,932	1,031,332
Less: Treasury stock, at cost	(746,364)	(718,933)
Total stockholders' equity	310,568	312,399
Total liabilities and stockholders' equity	$ 931,938	$ 933,437