CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Sep. 30, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 185,377	$ 284,375
Short-term investments	104,582	145,581
Accounts receivable, net	103,026	103,289
Inventory, net	60,717	56,473
Deferred tax asset	12,264	11,349
Other current assets	14,356	16,653
Total current assets	480,322	617,720
Long-term investments	59,030	39,332
Property, plant and equipment, net	74,249	70,622
Goodwill and purchased intangibles, net	14,531	14,861
Other assets	2,108	2,112
Total assets	630,240	744,647
Current liabilities:
Accounts payable	25,112	33,995
Accrued liabilities	51,329	59,607
Total current liabilities	76,441	93,602
Deferred tax liability	5,632	3,526
Long-term income taxes payable	13,436	11,524
Revolving line of credit	17,500	0
Other long-term liabilities	1,080	1,143
Total liabilities	114,089	109,795
Commitments and contingencies (Note 10)
Stockholders' equity:
Common stock	732	720
Additional paid-in capital	509,611	499,027
Accumulated other comprehensive income	4,932	1,473
Retained earnings	242,000	192,468
Total stockholders' equity before treasury stock	757,275	693,688
Less: Treasury stock, at cost	(241,124)	(58,836)
Total stockholders' equity	516,151	634,852
Total liabilities and stockholders' equity	$ 630,240	$ 744,647