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Postretirement Benefits - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
May 31, 2013 | May 31, 2012
Medicare |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Reimbursement from medicare | $ 74,000 | $ 69,000
POSTRETIREMENT BENEFITS | Minimum |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Estimated benefits payable in the first year | 1,100,000 |
Estimated benefits payable in the second year | 1,100,000 |
Estimated benefits payable in the third year | 1,100,000 |
Estimated benefits payable in the fourth year | 1,100,000 |
Estimated benefits payable in the fifth year | 1,100,000 |
Estimated benefits payable in the years thereafter | 8,400,000 |
POSTRETIREMENT BENEFITS | Maximum |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Estimated benefits payable in the first year | 1,400,000 |
Estimated benefits payable in the second year | 1,400,000 |
Estimated benefits payable in the third year | 1,400,000 |
Estimated benefits payable in the fourth year | 1,400,000 |
Estimated benefits payable in the fifth year | $ 1,400,000 |

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- Definition Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan. + 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=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan. + 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=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan. + 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=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan. + 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=21915506&loc=d3e1928-114920 + Details
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