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Acquisitions and Investments - Investments (Details) $ in Thousands		1 Months Ended		12 Months Ended
	May 06, 2013 USD ($)	Aug. 31, 2018 USD ($)	Jan. 31, 2011 USD ($)	Jun. 30, 2018 USD ($)
Investments
Investment		$ 6,700
Ownership percentage		39.50%
Convertible note		$ 5,000
Ownership percentage on an if-converted basis		56.00%
Term of debt		48 months
Investment reclassified	$ 10,000
Series D Preferred shares
Investments
Convertible into Series D Preferred shares		3,670
Base Rate
Investments
Interest rate spread added to base rate (as a percent)		25.00%
Web International Education Group, Ltd. (Web)
Investments
Ownership percentage			20.00%
Convertible note			$ 10,000
Web International Education Group, Ltd. (Web) \| Other current assets
Investments
Investment reclassified	$ 10,000			$ 10,000