Contingent Liabilities - Additional Information (Detail) (USD $)	6 Months Ended
Nov. 30, 2013
Loss Contingencies [Line Items]
Exposure related to legal matter	$ 2,000,000
Loss related to litigation settlement	2,000,000
Insurance proceeds for replacement value of damaged property and equipment	2,623,000
Book value of assets	145,000
Gain on damaged property and equipment	$ 2,478,000

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

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- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

Amount of gain recognized in the income statement for an event or transaction, that is unusual in nature or occurs infrequently, but not both.

+ References

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-Publisher FASB

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-Topic 225

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- Definition

Book value of assets destroyed in fire.

+ References

No definition available.

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