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Stock Repurchase - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
May 31, 2016 | May 31, 2015 | Dec. 31, 2008
Stock Repurchase Program [Line Items] |  |  |
Shares authorized to purchase |  |  | 1,125,000
Cumulative number of shares repurchased | 112,026 |  |
Cost of repurchased shares, including commissions | $ 923 |  |
Number of shares repurchased | 0 | 0 |

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