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Earnings per Share (Computation of Basic Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2013 | May 31, 2012 | May 31, 2011
Basic Earnings per Share |  |  |  |  |  |  |  |  |  |  |
Net income | $ 85,977 | $ 74,705 | $ 78,027 | $ 76,733 | $ 78,614 | $ 76,035 | $ 74,350 | $ 68,638 | $ 315,442 | $ 297,637 | $ 246,989
Less dividends to: |  |  |  |  |  |  |  |  |  |  |
Total dividends |  |  |  |  |  |  |  |  | 79,744 | 70,820 | 71,812
Undistributed net income |  |  |  |  |  |  |  |  | 235,698 | 226,817 | 175,177
Less: net income allocated to participating unvested securities |  |  |  |  |  |  |  |  | 1,896 | 1,880 | 1,097
Net income available to common shareholders |  |  |  |  |  |  |  |  | 233,802 | 224,937 | 174,080
Basic weighted average common shares outstanding (shares) | 122,392 | 123,120 | 124,185 | 126,110 | 128,788 | 129,735 | 129,727 | 131,309 | 123,956 | 129,891 | 146,586
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Total common shares (dollars per share) | $ 0.69 | $ 0.60 | $ 0.63 | $ 0.61 | $ 0.60 | $ 0.58 | $ 0.57 | $ 0.52 | $ 2.53 | $ 2.27 | $ 1.68
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Less dividends to: |  |  |  |  |  |  |  |  |  |  |
Total dividends |  |  |  |  |  |  |  |  | 78,866 | 70,055 | 71,197
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic, distributed (dollars per share) |  |  |  |  |  |  |  |  | $ 0.64 | $ 0.54 | $ 0.49
Earnings per share, basic, undistributed (dollars per share) |  |  |  |  |  |  |  |  | $ 1.89 | $ 1.73 | $ 1.19
Total common shares (dollars per share) |  |  |  |  |  |  |  |  | $ 2.53 | $ 2.27 | $ 1.68
Unvested shares [Member] |  |  |  |  |  |  |  |  |  |  |
Less dividends to: |  |  |  |  |  |  |  |  |  |  |
Total dividends |  |  |  |  |  |  |  |  | $ 878 | $ 765 | $ 615
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic, distributed (dollars per share) |  |  |  |  |  |  |  |  | $ 0.64 | $ 0.54 | $ 0.49
Earnings per share, basic, undistributed (dollars per share) |  |  |  |  |  |  |  |  | $ 1.89 | $ 1.73 | $ 1.19
Total common shares (dollars per share) |  |  |  |  |  |  |  |  | $ 2.53 | $ 2.27 | $ 1.68

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