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Employee Benefit Plans (Details) - Summary of weighted average actuarial assumptions utilized to benefit obligations	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Weighted average assumptions used to determine net periodic benefit cost:
Expected long-term return on plan assets	4.70%
Pension Plans [Member]
Weighted average assumptions used to determine benefit obligations:
Discount rate	3.50%	3.70%	4.10%
Rate of compensation increase	3.80%	4.10%	4.20%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate	3.70%	4.10%	4.00%
Expected long-term return on plan assets	4.70%	5.40%	7.50%
Rate of compensation increase	4.10%	4.20%	4.40%
Other Postretirement Benefits [Member]
Weighted average assumptions used to determine benefit obligations:
Discount rate	3.70%	3.80%	4.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate	3.80%	4.00%	3.90%
Expected long-term return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	0.00%

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The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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Expected rate of compensation increases (for pay-related plans).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
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The interest rate used to adjust for the time value of money.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

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Expected rate of compensation increases (for pay-related plans).

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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