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Retirement and Death Benefit Plans - Additional Information (Detail) (USD $) | 12 Months Ended
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May 31, 2014 | May 31, 2013
Compensation And Retirement Disclosure [Abstract] |  |
Employee retirement or disability, period over which benefits are to be paid | 10 years |
Life insurance contracts, discounting rate for present value calculation | 4.50% | 4.00%
Life insurance contracts, current and non current amounts recognized in balance Sheet | $ 5,856,000 | $ 6,309,000
Life insurance contracts, amount credited to operations | 152,000 |
Life insurance contracts, amount charged to operations |  | $ 187,000

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- Definition Employee retirement or disability duration for benefits payable under arrangement. + References No definition available. + Details
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- Definition Post retirement benefit plans insurance contracts amounts charged to operations. + References No definition available. + Details
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- Definition Post Retirement Benefit Plans Insurance Contracts Amounts Credited To Operations + References No definition available. + Details
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- Definition Post retirement benefit plans insurance contracts amounts recognized in balance sheet. + References No definition available. + Details
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- Definition Post retirement benefit plans insurance contracts present value discounting rate. + References No definition available. + Details
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- Details
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