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Stock Based Compensation Plans (Details Textuals) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  |  | 12 Months Ended
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May 31, 2011 | May 31, 2010 | May 31, 2009 | May 31, 2011 Employee Stock Option [Member] | May 31, 2010 Employee Stock Option [Member] | May 31, 2009 Employee Stock Option [Member] | May 31, 2008 Employee Stock Option [Member] | May 31, 2011 Stock Incentive Plan 1998 [Member] | May 31, 2011 Officers And Board [Member] | May 31, 2011 Officers and employees non-qualified stock options granted prior to July 2010 [Member] | May 31, 2011 Officers non-qualified stock options granted beginning in July 2010 [Member] | May 31, 2011 Board non-qualified stock options granted prior to October 2010 [Member] | May 31, 2011 Board non-qualified stock options granted beginning in October 2010 [Member] | May 31, 2011 Newly-hired employees stock option grants [Member] | May 31, 2011 Officers restricted stock awards granted prior to July 2010 [Member] | May 31, 2011 Officers restricted stock awards granted beginning in July 2010 [Member] | May 31, 2011 Board restricted stock awards granted prior to October 2010 [Member] | May 31, 2011 Board restricted stock awards granted beginning in October 2010 [Member] | May 31, 2011 Restricted Stock Unit [Member] | May 31, 2011 Performance shares vesting after performance period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options outstanding |  |  |  | 12.5 | 14.2 | 14.0 | 14.3 | 1.0 |  |  |  |  |  |  |  |  |  |  |  |
Vesting schedule |  |  |  |  |  |  |  |  |  | 20% per annum | 25% per annum | one-third per annum | After one year | 20% per annum | fifth anniversary | one-third per annum | third anniversary | one-year anniversary | 20% per annum with a small population of awards vesting on fourth-anniversary of grant date | one year
Performance period for unearned performance shares |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Stock Based Compensation Plans (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance under stock plan | 39.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for future grants | 24.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 24.8 | $ 25.6 | $ 25.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefits | 8.4 | 7.9 | 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to all unvested stock-based awards | $ 36.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period of all unvested stock based awards | 2.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
No of days of service to be eligible to receive grant of options for non-management employees | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual life of stock option grants | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition As of the balance-sheet date, the aggregate unrecognized cost of share-based awards made to employees under share-based compensation plans that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h + Details
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- Definition The weighted average period over which unrecognized compensation is expected to be recognized for share-based compensation plans, using a decimal to express in number of years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h + Details
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- Definition The total recognized tax benefit related to compensation cost for share-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) + Details
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- Definition The maximum number of shares originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the share-based compensation plan. As stock options and equity instruments other than options are awarded to participants, the shares remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a + Details
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- Definition The difference between the maximum number of shares authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares already issued upon exercise of options or other share-based awards under the plan, and 2) shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) + Details
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