Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax benefit (expense)	$ (757)	$ (35,313)	$ (15,057)
Gain on sale of business	3,200	96,400	26,917
Net income from discontinued operations	2,346	58,654	23,422
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	10,773	105,559
(Loss) income before income taxes, excluding gains from sale transactions and investments	(97)	(2,433)	10,622
Income tax benefit (expense)	24	706	(3,930)
Gain on sale of business	3,200	96,400	27,857
Income tax expense on net gain	(781)	(36,019)	(11,127)
Net income from discontinued operations	$ 2,346	$ 58,654	$ 23,422