Pension Plans - Additional Information (Detail) - Pension Benefits - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2021	May 31, 2021	May 31, 2020	May 31, 2019
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Average compensation with accrued benefits vesting period				5 years
Estimated benefits payable in the first year		$ 71,600,000
Estimated benefits payable in the second year		71,200,000
Estimated benefits payable in the third year		75,100,000
Estimated benefits payable in the fourth year		75,900,000
Estimated benefits payable in the fifth year		77,100,000
Estimated benefits payable in the years thereafter		375,800,000
Matching contribution charged to income		21,700,000	$ 21,100,000	$ 19,400,000
U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to retirement plans in the next fiscal year		1,000,000.0
Contribution to retirement plan in the current	$ 62,300,000	62,264,000	52,182,000
Required contribution to retirement plans in the current fiscal year		8,000
Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to retirement plans in the next fiscal year		5,000,000.0
Contribution to retirement plan in the current		$ 7,119,000	$ 6,331,000