CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 232,704	$ 228,776
Short-term investments	102,717	116,581
Accounts receivable, net	138,301	128,209
Inventory, net	57,132	67,435
Deferred tax assets	11,776	10,120
Other current assets	13,657	15,369
Total current assets	556,287	566,490
Long-term investments	100,342	80,261
Property, plant, and equipment, net	134,402	99,111
Goodwill and purchased intangibles, net	16,165	16,440
Other assets	4,619	2,303
Total assets	811,815	764,605
Current liabilities:
Accounts payable	30,756	37,067
Accrued liabilities	66,851	66,419
Total current liabilities	97,607	103,486
Deferred tax liabilities	0	1,742
Long-term income taxes payable	12,719	12,005
Other long-term liabilities	2,825	925
Total liabilities	113,151	118,158
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.01 par value per share; 1,000 shares authorized, no shares outstanding	0	0
Common stock, $0.01 par value per share; 100,000 shares authorized, 44,731 shares and 43,296 shares issued at 2014 and 2013, respectively	770	757
Additional paid-in capital	663,483	612,283
Accumulated other comprehensive income	2,638	5,567
Retained earnings	123,389	28,344
Total stockholders' equity before treasury stock	790,280	646,951
Less: Treasury stock (common: 2,082 shares and 13 shares at 2014 and 2013, respectively) at cost	(91,616)	(504)
Total stockholders' equity	698,664	646,447
Total liabilities and stockholders' equity	$ 811,815	$ 764,605