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Investments in Unconsolidated Affiliates - Financial Results of Four Largest Unconsolidated Affiliates (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
WAVE \| Discontinued Operations Held for Sale
Investments in and Advances to Affiliates [Line Items]
Net income attributable to discontinued operations	$ 6,830	$ 2,226	$ 6,775

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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