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Common Stock - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2014 Right | May 31, 2012
Shareholder Rights [Line Items] |  |
New stockholder right plan adopted | Apr. 21, 2009 |
Stockholder right plan expiration period | May 11, 2019 |
Right declared for distribution for each outstanding share of common stock | 1 |
Dividend payable date | May 11, 2009 |
Rights redemption price | $ 0.001 |
Rights reviewing period | The rights will expire May 11, 2019, unless earlier redeemed, exchanged or amended by the board. The plan specifically provides that our board will review the status of the plan before its fifth anniversary to determine if any such action should be taken, which it did. |
Shares repurchased |  | 164,773
Authorization of stock repurchase program | Jan. 08, 2008 |
Repurchase of common stock price per shares |  | $ 18.25
Treasury Stock |  |
Shareholder Rights [Line Items] |  |
Shares repurchased |  | $ 3.0
Minimum |  |
Shareholder Rights [Line Items] |  |
Percentage of outstanding shares acquired to exercise discount price | 15.00% |
Shares authorized to be repurchased, per year | 1,000,000 |
Maximum |  |
Shareholder Rights [Line Items] |  |
Shares authorized to be repurchased, per year | 2,000,000 |

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