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Organization and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Nov. 30, 2013
Organization and Summary of Significant Accounting Policies [Abstract]  
Summary of available-for-sale investments
 
Total Face Value as of 11/30/13
 
Tbills
    1,283,000  
CD
    4,923,000  
      6,206,000  
Contractual maturities of available-for-sale non-equity investments
 
   
Face value
   
Fair Value
 
   
(In thousands)
       
Maturing within one year
  $ 5,459,000     $ 5,457,566  
Maturing in one to three years
    747,000       746,996  
    $ 6,206,000     $ 6,204,562