Employee Benefit Plans (Details) - Schedule of total weighted average asset allocations - Pension Plans [Member]	May 31, 2017	May 31, 2016
U.S. [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	100.00%	100.00%
U.S. [Member] | Equity Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	13.40%	28.30%
U.S. [Member] | Debt Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	76.50%	69.20%
U.S. [Member] | Real Estate [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	0.00%	0.00%
U.S. [Member] | Other Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	10.10%	2.50%
U.K. [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	100.00%	100.00%
U.K. [Member] | Equity Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	38.80%	36.80%
U.K. [Member] | Debt Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	32.80%	33.80%
U.K. [Member] | Real Estate [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	6.90%	7.50%
U.K. [Member] | Other Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	21.50%	21.90%