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Employee Benefit Plans (Details) - Schedule of effect of one percentage point change in assumed health care cost trend rates - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014
Schedule of effect of one percentage point change in assumed health care cost trend rates [Abstract]
Total service and interest cost - 1% increase	$ 0.1	$ 0.1
Total service and interest cost - 1% decrease	(0.1)	(0.1)
Post-retirement benefit obligation - 1% increase	4.2	3.6
Post-retirement benefit obligation - 1% decrease	$ (3.6)	$ (3.1)

X

- References

No definition available.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ 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 (m)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ 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 (m)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ 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 (m)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ 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 (m)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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