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Other Comprehensive Income
6 Months Ended
Sep. 30, 2011
Stockholders' Equity and Other Comprehensive Income [Abstract] 
Other Comprehensive Income
16. Other Comprehensive Income
The difference between net income and total comprehensive income for the three and six months ended September 30, 2011 and September 30, 2010 is as follows (in thousands):
                                 
    Three Months Ended     Six Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
 
                               
Net income
  $ 3,172     $ 1,199     $ 23,860     $ 2,049  
Unrealized loss on available-for-sale investments, net of tax
    (219 )     —       (282 )     —  
 
                       
Comprehensive income
  $ 2,953     $ 1,199     $ 23,578     $ 2,049