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Fair Value of Financial Instruments
12 Months Ended
Mar. 31, 2011
Notes to Financial Statements [Abstract]  
Fair Value of Financial Instruments
 
7.
FAIR VALUE OF FINANCIAL INSTRUMENTS
 
The carrying amount of cash equivalents approximates fair value because their maturity is less than three months.  The carrying amount of short-term and long-term investments approximates fair value as the securities are marked to market as of each balance sheet date with any unrealized gains and losses reported in stockholders' equity.  The carrying amount of equity and cost-method adjustments approximates fair value at March 31, 2011 due to the short period of time that has elapsed since the recognition of these assets at fair value.  There were no material equity-method or cost-method investments at March 31, 2010.  The carrying amount of accounts receivable, accounts payable and accrued liabilities approximates fair value due to the short-term maturity of the amounts.  The fair value of the Company's junior subordinated convertible debentures was $1.574 billion at March 31, 2011 and $1.146 billion at March 31, 2010 based on the trading price of the bonds.