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, 2020	May 31, 2019
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)
Postretirement benefit obligation - 1% increase	1.9	2.1
Postretirement benefit obligation - 1% decrease	$ (1.7)	$ (1.9)

No definition available.

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- Definition

Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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- Definition

Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.

+ References

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- Definition

Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

+ References

+ Details

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- Definition

Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate.

+ References

+ Details

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