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Stock Repurchase Program - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2016 USD ($) shares | Feb. 29, 2016 USD ($) shares
Stock Repurchase Programs [Line Items] |  |
Authorization of stock repurchase program |  | Jan. 08, 2008
Shares repurchased | 400,000 | 800,000
Shares repurchased, value | $ | $ 17.8 | $ 35.1
Minimum |  |
Stock Repurchase Programs [Line Items] |  |
Shares authorized to be repurchased, per year | 1,000,000 | 1,000,000
Maximum |  |
Stock Repurchase Programs [Line Items] |  |
Shares authorized to be repurchased, per year | 2,000,000 | 2,000,000

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