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Fair Value Measurements (Tables)
3 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Fair value of financial assets
                                 
            Quoted Prices in                
            Active             Significant  
            Markets for     Significant Other     Unobservable  
            Identical Assets     Observable Inputs     Inputs  
    Total     (Level 1)     (Level 2)     (Level 3)  
Cash and cash equivalents
  $ 161,092     $ 161,092     $     $  
 
                       
Total assets recorded at fair value
  $ 161,092     $ 161,092     $     $  
 
                       
Assets measured at fair value
         
Balance at June 30, 2011
  $ 529  
Redemptions
    (529 )
 
     
Balance at September 30, 2011
  $