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Employee Benefit Plans (Details) - Schedule of targeted weighted average asset allocations
12 Months Ended
May. 31, 2015
U.S. Pension Plan [Member]  
Defined Benefit Plan, Assets, Target Allocations [Abstract]  
Targeted asset allocation 100.00%
U.S. Pension Plan [Member] | Equity Securities [Member]  
Defined Benefit Plan, Assets, Target Allocations [Abstract]  
Targeted asset allocation 30.00%
U.S. Pension Plan [Member] | Debt and cash equivalent [Member]  
Defined Benefit Plan, Assets, Target Allocations [Abstract]  
Targeted asset allocation 70.00%
U.S. Pension Plan [Member] | Real estate and other [Member]  
Defined Benefit Plan, Assets, Target Allocations [Abstract]  
Targeted asset allocation 0.00%
UK Pension Plan [Member]  
Defined Benefit Plan, Assets, Target Allocations [Abstract]  
Targeted asset allocation 100.00%
UK Pension Plan [Member] | Equity Securities [Member]  
Defined Benefit Plan, Assets, Target Allocations [Abstract]  
Targeted asset allocation 40.00%
UK Pension Plan [Member] | Debt and cash equivalent [Member]  
Defined Benefit Plan, Assets, Target Allocations [Abstract]  
Targeted asset allocation 30.00%
UK Pension Plan [Member] | Real estate and other [Member]  
Defined Benefit Plan, Assets, Target Allocations [Abstract]  
Targeted asset allocation 30.00%