CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 209,335	$ 277,373
Short-term investments	125,177	152,583
Accounts receivable, net	111,771	103,289
Inventory, net	53,713	56,473
Deferred tax assets	11,090	11,349
Other current assets	13,088	16,653
Total current assets	524,174	617,720
Long-term investments	55,347	39,332
Property, plant and equipment, net	76,159	70,622
Goodwill and purchased intangibles, net	14,388	14,861
Other assets	2,402	2,112
Total assets	672,470	744,647
Current liabilities:
Accounts payable	34,126	33,995
Accrued liabilities	52,067	59,607
Total current liabilities	86,193	93,602
Deferred tax liabilities	8,673	3,526
Long-term income taxes payable	12,150	11,524
Revolving line of credit	37,000	0
Other long-term liabilities	1,210	1,143
Total liabilities	145,226	109,795
Commitments and contingencies (Note 10)
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, 47,160 shares and 50,043 shares issued at 2012 and 2011, respectively	741	720
Additional paid-in capital	557,218	499,027
Accumulated other comprehensive income	6,357	1,473
Retained earnings	115,358	192,468
Total stockholders' equity before treasury stock	679,674	693,688
Less: Treasury stock (common: 4,648 and 1,728 shares at 2012 and 2011, respectively) at cost	(152,430)	(58,836)
Total stockholders' equity	527,244	634,852
Total liabilities and stockholders' equity	$ 672,470	$ 744,647