CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Jun. 30, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 202,747	$ 284,375
Short-term investments	127,058	145,581
Accounts receivable, net	108,516	103,289
Inventory, net	57,697	56,473
Deferred income taxes	11,753	11,349
Other current assets	15,073	16,653
Total current assets	522,844	617,720
Long-term investments	56,462	39,332
Property, plant and equipment, net	71,542	70,622
Goodwill and purchased intangibles, net	14,665	14,861
Other assets	2,056	2,112
Total assets	667,569	744,647
Current liabilities:
Accounts payable	27,311	33,995
Accrued liabilities	53,769	59,607
Total current liabilities	81,080	93,602
Deferred tax liability	3,550	3,526
Long-term income taxes payable	13,036	11,524
Other long-term liabilities	1,112	1,143
Total liabilities	98,778	109,795
Stockholders' equity:
Common stock	729	720
Additional paid-in capital	498,056	499,027
Accumulated other comprehensive income	3,443	1,473
Retained earnings	216,772	192,468
Total stockholders' equity before treasury stock	719,000	693,688
Less: Treasury stock, at cost	(150,209)	(58,836)
Total stockholders' equity	568,791	634,852
Total liabilities and stockholders' equity	$ 667,569	$ 744,647