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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands			12 Months Ended			14 Months Ended
	Dec. 27, 2016	Apr. 21, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017
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
Significant Unobservable Inputs (Level 3) | 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			$ 2,806	$ 9,748	$ 6,801
Purchases, Issuances and Settlements				(9,134)	2,942
Unrealized Gains/(Losses)				2,192	5
Fair Value, end of period				2,806	9,748	$ 2,806
Significant Unobservable Inputs (Level 3) | 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				6,801	6,801
Purchases, Issuances and Settlements				(9,134)
Unrealized Gains/(Losses)				2,333
Redeemable noncontrolling interest fair value, ending balance					6,801
LTS
Fair value measurements categorized as Level 3 of the valuation hierarchy, valued on a recurring basis
Ownership percentage acquired (as a percent)		100.00%
Cash purchase price		$ 20,200				20,200
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			2,806
Contingent consideration, fair value, ending balance			1,345	2,806		2,806
Acquisitions | Significant Unobservable Inputs (Level 3) | 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			2,806	2,947
Purchases, Issuances and Settlements			(1,319)		2,942
Unrealized Gains/(Losses)			(142)	(141)	5
Contingent consideration, fair value, ending balance			$ 1,345	$ 2,806	$ 2,947	$ 2,806

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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-Publisher FASB
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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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