Retirement and Death Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
May. 31, 2015	May. 31, 2014
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	4.00%	4.50%
Life insurance contracts, current and non current amounts recognized in balance Sheet	$ 5,707,000	$ 5,856,000
Life insurance contracts, amount charged to operations	$ 161,000
Life insurance contracts, amount credited to operations		$ 152,000

Employee retirement or disability duration for benefits payable under arrangement.

No definition available.

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Post retirement benefit plans insurance contracts amounts charged to operations.

No definition available.

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Post Retirement Benefit Plans Insurance Contracts Amounts Credited To Operations

No definition available.

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Post retirement benefit plans insurance contracts amounts recognized in balance sheet.

No definition available.

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Post retirement benefit plans insurance contracts present value discounting rate.

No definition available.

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No definition available.

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