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Postretirement Benefits - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
May. 31, 2014 | May. 31, 2015
Medicare |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Reimbursement from medicare | $ 37,000 |
Minimum | POSTRETIREMENT BENEFITS |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Estimated benefits payable in the first year |  | $ 900,000
Estimated benefits payable in the second year |  | 900,000
Estimated benefits payable in the third year |  | 900,000
Estimated benefits payable in the fourth year |  | 900,000
Estimated benefits payable in the fifth year |  | 900,000
Estimated benefits payable in the years thereafter |  | 7,500,000
Maximum | POSTRETIREMENT BENEFITS |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Estimated benefits payable in the first year |  | 1,200,000
Estimated benefits payable in the second year |  | 1,200,000
Estimated benefits payable in the third year |  | 1,200,000
Estimated benefits payable in the fourth year |  | 1,200,000
Estimated benefits payable in the fifth year |  | $ 1,200,000

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- Definition Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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