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Summary of Significant Accounting Policies (Details 7) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Assets and liabilities measured at fair value on a recurring basis      
Redeemable Noncontrolling Interest In Middlebury Joint Venture $ 17,200 $ 17,200 $ 17,374
Measured on a recurring basis | Fair value
     
Assets and liabilities measured at fair value on a recurring basis      
Redeemable Noncontrolling Interest In Middlebury Joint Venture 17,200 17,200  
Total 27,200 27,200  
Measured on a recurring basis | Fair value | Investment In Web International Education Group
     
Assets and liabilities measured at fair value on a recurring basis      
Investment In Web International Education Group 10,000 10,000  
Measured on a recurring basis | Significant Unobservable Inputs (Level 3)
     
Assets and liabilities measured at fair value on a recurring basis      
Redeemable Noncontrolling Interest In Middlebury Joint Venture 17,200 17,200  
Total 27,200 27,200  
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Investment In Web International Education Group
     
Assets and liabilities measured at fair value on a recurring basis      
Investment In Web International Education Group $ 10,000 $ 10,000