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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 27, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Middlebury Interactive Languages LLC          
Fair value measurements categorized as Level 3 of the valuation hierarchy, valued on a recurring basis          
Ownership percentage acquired (as a percent) 40.00%        
Cash purchase price $ 9,100        
Measured on a recurring basis          
Fair value measurements categorized as Level 3 of the valuation hierarchy, valued on a recurring basis          
Fair Value, beginning of period   $ 838 $ 12,156 $ 2,806 $ 9,748
Purchases, Issuances and Settlements   500 (9,134) (1,319) (9,134)
Unrealized Gains/(Losses)   2 (59) (147) 2,349
Fair Value, end of period   1,340 2,963 1,340 2,963
Measured on a recurring basis | Middlebury Interactive Languages LLC          
Fair value measurements categorized as Level 3 of the valuation hierarchy, valued on a recurring basis          
Redeemable noncontrolling interest fair value, beginning balance     9,201   6,801
Purchases, Issuances and Settlements     (9,134)   (9,134)
Unrealized Gains/(Losses)     (67)   2,333
Acquisitions | Measured on a recurring basis          
Fair value measurements categorized as Level 3 of the valuation hierarchy, valued on a recurring basis          
Contingent consideration, fair value, beginning balance   838 2,955 2,806 2,947
Purchases, Issuances and Settlements   500   (1,319)  
Unrealized Gains/(Losses)   2 8 (147) 16
Contingent consideration, fair value, ending balance   $ 1,340 $ 2,963 $ 1,340 $ 2,963