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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2015
Assets and liabilities measured at fair value on a recurring and nonrecurring basis          
Held for sale asset     $ 1,200    
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Middlebury Interactive Languages LLC          
Assets and liabilities measured at fair value on a recurring and nonrecurring basis          
Redeemable Noncontrolling Interest Fair Value       $ 6,801 $ 6,801
Measured on a nonrecurring basis          
Assets and liabilities measured at fair value on a recurring and nonrecurring basis          
Held for sale asset   $ 1,200      
Lease exit liability $ 2,758 4,841      
Measured on a nonrecurring basis | Significant Unobservable Inputs (Level 3)          
Assets and liabilities measured at fair value on a recurring and nonrecurring basis          
Held for sale asset   1,200      
Lease exit liability 2,758 4,841      
Acquisitions | Measured on a recurring basis          
Assets and liabilities measured at fair value on a recurring and nonrecurring basis          
Contingent consideration 1,345 2,806      
Acquisitions | Measured on a recurring basis | Significant Unobservable Inputs (Level 3)          
Assets and liabilities measured at fair value on a recurring and nonrecurring basis          
Contingent consideration $ 1,345 $ 2,806   $ 2,947