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Employee Benefit Plans (Details) - Schedule of total weighted average asset allocations - Pension Plans [Member] | May 31, 2017 | May 31, 2016
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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%

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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