Investments in Unconsolidated Affiliates - Schedule of Combined Financial Information for Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	May 31, 2020	May 31, 2019
Equity Method Investments And Joint Ventures [Abstract]
Cash	$ 68,730	$ 37,471
Other current assets	528,631	594,959
Current assets for discontinued operations		35,793
Noncurrent assets	399,731	360,925
Total assets	997,092	1,029,148
Current liabilities	174,709	236,781
Current liabilities for discontinued operations		9,610
Short-term borrowings	500	15,162
Current maturities of long-term debt	37,542	33,003
Long-term debt	346,690	321,791
Other noncurrent liabilities	73,656	18,192
Equity	363,995	394,609
Total liabilities and equity	$ 997,092	$ 1,029,148