Employee Benefit Plans (Details) - Schedule of total weighted average asset allocations - Pension Plans [Member]	May 31, 2018	May 31, 2017
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	0.00%	13.40%
U.S. [Member] | Debt Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	0.00%	76.50%
U.S. [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	100.00%	0.00%
U.S. [Member] | Liability Driven Instruments [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	0.00%	0.00%
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	0.00%	10.10%
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	38.60%	38.80%
U.K. [Member] | Debt Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	0.00%	32.80%
U.K. [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	2.60%	0.00%
U.K. [Member] | Liability Driven Instruments [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	32.80%	0.00%
U.K. [Member] | Real Estate [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	7.50%	6.90%
U.K. [Member] | Other Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	18.50%	21.50%