Summary of Accounts Receivable Net of Allowances and Net Contract Assets (Liabilities) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2019	May 31, 2019
Disaggregation Of Revenue [Line Items]
Accounts receivable, less allowance	$ 1,109,259	$ 1,232,350
Contract assets	26,464	21,628
Contract liabilities - short-term	(27,402)	(25,896)
Net Contract Liabilities	(938)	$ (4,268)
Change in Contract with Customer, Asset and Liability [Abstract]
Change in accounts receivable, less allowance	(123,091)
Change in contract assets	4,836
Change in Net Contract Liabilities	$ 3,330
Percentage of change in accounts receivable, less allowance	(10.00%)
Percentage of change in contract assets	22.40%
Percentage of change in Net Contract Liabilities	(78.00%)
Short-term
Change in Contract with Customer, Asset and Liability [Abstract]
Change in contract liabilities	$ (1,506)
Percentage of change in contract liabilities	5.80%