Employee Benefit Plans (Details) - Schedule of effect of one percentage point change in assumed health care cost trend rates (USD $) In Millions, unless otherwise specified	12 Months Ended
May 31, 2014	May 31, 2013
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	$ 0.2
Total service and interest cost - 1% decrease	(0.1)	(0.1)
Post-retirement benefit obligation - 1% increase	3.6	4.0
Post-retirement benefit obligation - 1% decrease	$ (3.1)	$ (3.4)

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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=28361610&loc=d3e1928-114920

+ Details

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- Definition

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

+ Details

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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

+ Details

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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

+ Details

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