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Common Stock - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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May 31, 2013 Right | May 31, 2012 | May 31, 2011
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 new plan specifically provides that our board will review the status of the new plan before its fifth anniversary to determine if any such action should be taken. |  |
Shares repurchased |  | 164,773 | 1.0
Authorization of stock repurchase program | Jan. 08, 2008 |  |
Repurchase of common stock price per shares |  | $ 18.25 | $ 17.33
Treasury Stock |  |  |
Shareholder Rights [Line Items] |  |  |
Shares repurchased |  | $ 3.0 | $ 17.9
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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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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