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401(K) Plan - Additional Information (Detail) (USD $) | 12 Months Ended
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May 31, 2014 | May 31, 2013
Compensation Related Costs [Abstract] |  |
Profit sharing contribution | $ 0 | $ 0

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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