Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
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
Measured on a nonrecurring basis
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Lease exit liability	$ 1,779	$ 2,758
Measured on a nonrecurring basis | Significant Unobservable Inputs (Level 3)
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Lease exit liability	1,779	2,758
Acquisitions | Measured on a recurring basis
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Contingent consideration		1,345
Convertible note	5,006
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
Convertible note	5,006
Acquisitions | Corporate Note Securities [Member] | Measured on a recurring basis | Significant Unobservable Inputs (Level 3)
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Convertible note	$ 5,006