Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax (expense) benefit	$ (6)	$ 624	$ 4	$ (41,103)
(Loss) gain on sale of business			0	99,060
Net income (loss) from discontinued operations	19	(628)	(13)	55,475
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	0	0	10,773
Income (loss) before income taxes	25	(43)	(17)	(2,482)
Income tax (expense) benefit	(6)	18	4	920
(Loss) gain on sale of business	0	(1,209)	0	99,060
Income tax benefit (expense) on net gain	0	606	0	(42,023)
Net income (loss) from discontinued operations	$ 19	$ (628)	$ (13)	$ 55,475

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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