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Postretirement Benefits - Additional Information (Detail) - Postretirement Benefits $ in Millions | May 31, 2019 USD ($)
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Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |
Estimated benefits payable in the years thereafter | $ 9.0
Minimum |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |
Estimated benefits payable in the first year | 1.2
Estimated benefits payable in the second year | 1.2
Estimated benefits payable in the third year | 1.2
Estimated benefits payable in the fourth year | 1.2
Estimated benefits payable in the fifth year | 1.2
Maximum |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |
Estimated benefits payable in the first year | 1.5
Estimated benefits payable in the second year | 1.5
Estimated benefits payable in the third year | 1.5
Estimated benefits payable in the fourth year | 1.5
Estimated benefits payable in the fifth year | $ 1.5

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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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