Pension Plans - Additional Information (Detail) - Pension Benefits - USD ($)	1 Months Ended	12 Months Ended
	Feb. 29, 2020	May 31, 2020	May 31, 2019	May 31, 2018
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Average compensation with accrued benefits vesting period			5 years
Matching contribution charged to income		$ 21,100,000	$ 19,400,000	$ 18,700,000
Estimated benefits payable in the first year		71,000,000.0
Estimated benefits payable in the second year		71,000,000.0
Estimated benefits payable in the third year		70,600,000
Estimated benefits payable in the fourth year		70,100,000
Estimated benefits payable in the fifth year		67,300,000
Estimated benefits payable in the years thereafter		339,200,000
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		8,000
Additional contribution to retirement plan in the current	$ 51,500,000	52,182,000	57,821,000
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		6,700,000
Additional contribution to retirement plan in the current		$ 6,331,000	$ 6,770,000