Rescission Liabilities - Additional Information (Detail) - USD ($) |
May. 31, 2015 |
May. 31, 2014 |
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| Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] | ||
| Rescission liability | $ 0 | $ 378,000 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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