Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

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Employee Benefit Plans (Details) - USD ($)
$ in Millions
7 Months Ended 12 Months Ended 21 Months Ended
May. 31, 2014
May. 31, 2015
May. 31, 2014
May. 31, 2013
Nov. 14, 2013
Employee Benefit Plans [Abstract]          
Years of service to be eligible for Company match contribution   1 year      
Maximum percentage of salary deferral under 401(k) plan   50.00%      
Company contributions to the plan   $ 19.6 $ 16.4 $ 13.1  
Amounts accrued under deferred compensation plans $ 12.3 $ 14.2 $ 12.3    
Percentage of eligible pay that is matched by the employer   50.00%      
Percentage of employee pay eligible for employer matching contribution 8.00% 8.00%     6.00%
Percentage of annual base salary that eligible employees can defer under Deferred Compensation Plan   50.00%      
Percentage of board cash compensation that may be deferred under Deferred Compensation Plan   100.00%