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Pension Plans - Additional Information (Detail) - Pension Benefits - USD ($)
$ in Millions
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Average compensation with accrued benefits vesting period 5 years    
Contribution to retirement plans in the next fiscal year $ 52.8    
Matching contribution charged to income 18.7 $ 17.4 $ 16.3
Estimated benefits payable in the first year 54.0    
Estimated benefits payable in the second year 58.4    
Estimated benefits payable in the third year 56.2    
Estimated benefits payable in the fourth year 59.1    
Estimated benefits payable in the fifth year 60.4    
Estimated benefits payable in the years thereafter 318.0    
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 1.3    
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 $ 8.1