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Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2011 | Feb. 28, 2011 | Nov. 30, 2010 | Aug. 31, 2010 | May 31, 2012 | May 31, 2011 | May 31, 2010
Basic Earnings per Share |  |  |  |  |  |  |  |  |  |  |
Net income | $ 78,614 | $ 76,035 | $ 74,350 | $ 68,638 | $ 70,776 | $ 59,070 | $ 55,866 | $ 61,277 | $ 297,637 | $ 246,989 | $ 215,620
Less dividends to: |  |  |  |  |  |  |  |  |  |  |
Total dividends |  |  |  |  |  |  |  |  | 70,820 | 71,812 | 73,960
Undistributed net income |  |  |  |  |  |  |  |  | 226,817 | 175,177 | 141,660
Less: net income allocated to participating unvested securities |  |  |  |  |  |  |  |  | 1,880 | 1,097 | 661
Net income available to common shareholders |  |  |  |  |  |  |  |  | 224,937 | 174,080 | 140,999
Basic weighted average common shares outstanding (in shares) | 128,788 | 129,735 | 129,727 | 131,309 | 143,317 | 145,303 | 145,511 | 152,164 | 129,891 | 146,586 | 152,858
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Total common shares (in dollars per share) | $ 0.60 | $ 0.58 | $ 0.57 | $ 0.52 | $ 0.49 | $ 0.41 | $ 0.38 | $ 0.40 | $ 2.27 | $ 1.68 | $ 1.40
Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |
Net income | 78,614 | 76,035 | 74,350 | 68,638 | 70,776 | 59,070 | 55,866 | 61,277 | 297,637 | 246,989 | 215,620
Less dividends to: |  |  |  |  |  |  |  |  |  |  |
Total dividends |  |  |  |  |  |  |  |  | 70,820 | 71,812 | 73,960
Undistributed net income |  |  |  |  |  |  |  |  | 226,817 | 175,177 | 141,660
Less: net income allocated to participating unvested securities |  |  |  |  |  |  |  |  | 1,880 | 1,097 | 661
Net income available to common shareholders |  |  |  |  |  |  |  |  | 224,937 | 174,080 | 140,999
Basic weighted average common shares outstanding (in shares) | 128,788 | 129,735 | 129,727 | 131,309 | 143,317 | 145,303 | 145,511 | 152,164 | 129,891 | 146,586 | 152,858
Effect of dilutive securities - employee stock options (in shares) |  |  |  |  |  |  |  |  | 142 | 0 | 0
Diluted weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 130,033 | 146,586 | 152,858
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share (in dollars per share) | $ 0.60 | $ 0.58 | $ 0.57 | $ 0.52 | $ 0.49 | $ 0.41 | $ 0.38 | $ 0.40 | $ 2.27 | $ 1.68 | $ 1.40
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Less dividends to: |  |  |  |  |  |  |  |  |  |  |
Total dividends |  |  |  |  |  |  |  |  | 70,055 | 71,197 | 73,377
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic, distributed (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.54 | $ 0.49 | $ 0.48
Earnings per share, basic, undistributed (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.73 | $ 1.19 | $ 0.92
Total common shares (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.27 | $ 1.68 | $ 1.40
Less dividends to: |  |  |  |  |  |  |  |  |  |  |
Total dividends |  |  |  |  |  |  |  |  | 70,055 | 71,197 | 73,377
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Earnings per share, diluted, distributed (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.54 | $ 0.49 | $ 0.48
Earnings per share, diluted, undistributed (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.73 | $ 1.19 | $ 0.92
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.27 | $ 1.68 | $ 1.40
Unvested shares [Member] |  |  |  |  |  |  |  |  |  |  |
Less dividends to: |  |  |  |  |  |  |  |  |  |  |
Total dividends |  |  |  |  |  |  |  |  | 765 | 615 | 583
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic, distributed (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.54 | $ 0.49 | $ 0.48
Earnings per share, basic, undistributed (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.73 | $ 1.19 | $ 0.92
Total common shares (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.27 | $ 1.68 | $ 1.40
Less dividends to: |  |  |  |  |  |  |  |  |  |  |
Total dividends |  |  |  |  |  |  |  |  | $ 765 | $ 615 | $ 583
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Earnings per share, diluted, distributed (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.54 | $ 0.49 | $ 0.48
Earnings per share, diluted, undistributed (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.73 | $ 1.19 | $ 0.92
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.27 | $ 1.68 | $ 1.40

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- Definition The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 61 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-6 -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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