CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 31, 2015
Current assets:
Cash and cash equivalents	$ 219,091	$ 276,850
Short-term investments	166,257	97,859
Accounts receivable, net	136,402	136,581
Inventory, net	55,650	56,676
Deferred tax assets	6,548	6,564
Other current assets	28,403	28,124
Total current assets	612,351	602,654
Long-term investments	135,164	107,590
Property, plant, and equipment, net	145,349	139,413
Goodwill and purchased intangibles, net	15,890	16,077
Other assets	8,767	10,308
Total assets	917,521	876,042
Current liabilities:
Accounts payable	39,738	32,781
Accrued liabilities	63,161	62,041
Total current liabilities	102,899	94,822
Long term debt, net of issuance costs	489,246	0
Long-term income taxes payable	12,219	12,984
Revolving line of credit	0	34,500
Other long-term liabilities	9,730	6,339
Total liabilities	$ 614,094	$ 148,645
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock	$ 792	$ 783
Additional paid-in capital	754,918	717,848
Accumulated other comprehensive income	2,432	10,120
Retained earnings	249,338	209,960
Total stockholders' equity before treasury stock	1,007,480	938,711
Less: Treasury stock, at cost	(704,053)	(211,314)
Total stockholders' equity	303,427	727,397
Total liabilities and stockholders' equity	$ 917,521	$ 876,042