Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Narrative) (Details)

v3.10.0.1
Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
2 Months Ended 10 Months Ended 12 Months Ended
May 31, 2018
Mar. 29, 2018
May 31, 2018
May 31, 2017
May 31, 2016
Deferred Compensation Plans [Member]          
Defined Contribution Plan Disclosure [Line Items]          
Percentage of annual base salary and bonus that eligible employees may defer     50.00%    
Percentage of Board cash compensation that eligible outside directors may defer     100.00%    
Amounts accrued under deferred compensation plans $ 18.2   $ 18.2 $ 16.7  
401 (K) Plan [Member]          
Defined Contribution Plan Disclosure [Line Items]          
Maximum percentage of salary deferral     50.00%    
Years of service to be eligible for matching contribution     1 year    
Minimum number of hours worked for eligibility     1000 hours    
Employer's matching contribution as a percent of the first 3% of employees' salary contributed 100.00%        
Percentage of employees' salary contributed matched 100% by employer 3.00%        
Employer's matching contribution as a percent of the next 2% of employees' salary contributed 50.00%        
Percentage of employees' salary contributed matched 50% by employer 2.00%        
Percentage of employer matching contributions of eligible employee pay   50.00%      
Total percentage of employees' salary contributed matched by employer 4.00%        
Company contributions to the plan     $ 23.6 $ 22.4 $ 21.4
Percentage participant directed     100.00%    
401 (K) Plan [Member] | Maximum [Member]          
Defined Contribution Plan Disclosure [Line Items]          
Percentage of employees' salary contributed matched by employer   8.00%