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Marketable Securities And Fair Value Disclosures (Tables)
 12 Months Ended
Mar. 31, 2012
Marketable Securities And Fair Value Disclosures [Abstract]  
Summary Of Marketable Securities
        Gross   Gross Fair Market
    Cost at   Unrealized   Unrealized Value at
    March 31, 2012   Gains   Losses March 31, 2012
 
Short-term commercial paper $ 5,276 $ 28 $ — 5,304

 

 

        Gross   Gross     Fair Market
    Cost at   Unrealized   Unrealized     Value at
    March 31, 2011   Gains   Losses     March 31, 2011
 
Short-term government-backed securities $ 76,368 $ 21 $ (18 ) $ 76,371
 
Short-term commercial paper   39,728   45   (18 )   39,755
Assets And Liabilities Carried At Fair Value

 

    Total   Quoted Prices in   Using Significant Other   Using Significant
    Carrying   Active Markets   Observable Inputs   Unobservable Inputs
    Value   (Level 1)   (Level 2)   (Level 3)
March 31, 2012:                
Assets:                
Cash equivalents $ 23,485 $ 23,485 $ — $ —
Short-term commercial paper   5,304   —   5,304   —
    Total   Quoted Prices in   Using Significant Other   Using Significant
    Carrying   Active Markets   Observable Inputs   Unobservable Inputs
    Value   (Level 1)   (Level 2)   (Level 3)
March 31, 2011:                
Assets:                
Cash equivalents $ 49,837 $ 49,837 $ — $ —
Short-term government-backed securities   76,371   —   76,371   —
Short-term commercial paper   39,755   —   39,755   —
Derivatives   3,087   —   3,087   —