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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($)
$ in Thousands
 6 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Noncontrolling Interests            
Cash paid $ 9,134          
Measured on a recurring basis            
Assets and liabilities measured at fair value on a recurring and nonrecurring basis            
Total 2,963 $ 1,340 $ 838 $ 2,806 $ 12,156 $ 9,748
Measured on a recurring basis | Middlebury Interactive Languages LLC            
Assets and liabilities measured at fair value on a recurring and nonrecurring basis            
Redeemable Noncontrolling Interest Fair Value         9,201 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   1,200    
Lease exit liability   4,000   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   1,200    
Lease exit liability   4,000   4,841    
Acquisitions | Measured on a recurring basis            
Assets and liabilities measured at fair value on a recurring and nonrecurring basis            
Contingent consideration $ 2,963 1,340 $ 838 2,806 $ 2,955 $ 2,947
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   $ 1,340   $ 2,806