Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Mar. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 35,947	$ 38,394
Investments - short-term	211,796	162,928
Receivables	34,584	22,969
Inventory	17,569	20,425
Prepaid expenses and other current assets	8,489	8,244
Total current assets	308,385	252,960
PROPERTY, PLANT AND EQUIPMENT, NET	94,332	95,020
INVESTMENTS - LONG-TERM	37,637	93,408
OTHER ASSETS	10,882	11,060
TOTAL ASSETS	451,236	452,448
CURRENT LIABILITIES:
Accounts payable and accrued expenses	41,621	44,934
Deferred revenue - current	3,905	3,123
Total current liabilities	45,526	48,057
DEFERRED REVENUE - LONG-TERM	4,529	4,837
OTHER LONG-TERM LIABILITIES	7,292	7,536
Total liabilities	57,347	60,430
COMMITMENTS AND CONTINGENCIES (Note 11)
SHAREHOLDERS' EQUITY:
Common stock	1,067	1,055
Treasury stock, at cost (10,226,304 and 10,069,208 shares at June 30, 2011 and March 31, 2011, respectively)	(133,933)	(131,095)
Additional paid-in capital	953,701	936,295
Accumulated other comprehensive loss	(2,484)	(3,013)
Accumulated deficit	(424,466)	(411,228)
Total shareholders' equity	393,889	392,018
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	451,236	452,448
Non-voting common stock
SHAREHOLDERS' EQUITY:
Common stock	$ 4	$ 4