Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax benefit	$ 10	$ (41,727)
Gain on sale of business	0	100,269
Net (loss) income from discontinued operations	(32)	56,103
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	10,773
Loss before income taxes	(42)	(2,439)
Income tax benefit	10	902
Gain on sale of business	0	100,269
Income tax expense on net gain	0	(42,629)
Net (loss) income from discontinued operations	$ (32)	$ 56,103