Summary of Trade Accounts Receivable Net of Allowances and Net Contract Assets (Liabilities) (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020
Disaggregation Of Revenue [Line Items]
Trade accounts receivable, less allowance	$ 1,280,806	$ 1,137,957
Contract assets	33,217	25,249
Contract liabilities - short-term	(33,112)	(25,288)
Net Contract Assets/(Liabilities)	105	$ (39)
Change in Contract with Customer, Asset and Liability [Abstract]
Change in trade accounts receivable, less allowance	142,849
Change in contract assets	7,968
Change in Net Contract Assets (Liabilities)	$ 144
Percentage of change in trade accounts receivable, less allowance	12.60%
Percentage of change in contract assets	31.60%
Percentage of change in Net Contract Assets/(Liabilities)	(369.20%)
Short-term
Change in Contract with Customer, Asset and Liability [Abstract]
Change in contract liabilities	$ (7,824)
Percentage of change in contract liabilities	30.90%