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Investments - Additional Information (Detail) (U. S. Treasury Bills [Member], USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2014 | May 31, 2013
U. S. Treasury Bills [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment maturity period |  | 3 months
U. S. Treasury Bills, gross amortized cost | $ 5,000,000 |

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- Definition Investment securities maturity period. + References No definition available. + Details
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- Definition The aggregate value of securities held, which were categorized as held-to-maturity, for which the interest rate reset through an auction process, that failed to be liquidated through auction, and which were sold at par value during the period. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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