Summary of Significant Accounting Policies - Cash - Additional Information (Detail) - USD ($) |
Nov. 30, 2015 |
May. 31, 2015 |
May. 31, 2014 |
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| Summary Of Significant Accounting Policies [Line Items] | |||
| Balance in excess of federally insured limits | $ 3,339,000 | $ 1,164,000 | $ 4,589,000 |
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- Definition Summary Of Significant Accounting Policies [Line Items] No definition available.
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. No definition available.
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