Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 37,809	$ 33,510	$ 20,525
Additions	40,789	10,761	13,358
Deductions	16,431	6,462	373
Balance at End of Year	$ 62,167	$ 37,809	$ 33,510