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Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended			12 Months Ended
	Dec. 27, 2016	Jul. 31, 2014	Jan. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017
Purchase price allocation for LearnBop
Current assets							$ 209
Intangible assets							695
Summary of activity of the redeemable noncontrolling interest
Net loss				$ (27)	$ (70)	$ (103)	$ (200)	$ (910)
Adjustments to redemption value								$ 3,245
LearnBop
Cash purchase price		$ 6,500	$ 500
Ownership percentage acquired (as a percent)		51.00%	49.00%
Middlebury Interactive Languages LLC
Cash purchase price	$ 9,100
Ownership percentage acquired (as a percent)	40.00%