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Stock Repurchase Program - Additional Information (Detail) $ in Millions | 3 Months Ended
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Aug. 31, 2015 USD ($) shares
Stock Repurchase Programs [Line Items] |
Authorization of stock repurchase program | Jan. 08, 2008
Shares repurchased | 300,000
Shares repurchased, value | $ | $ 12.8
Minimum |
Stock Repurchase Programs [Line Items] |
Shares authorized to be repurchased, per year | 1,000,000
Maximum |
Stock Repurchase Programs [Line Items] |
Shares authorized to be repurchased, per year | 2,000,000

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