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Earnings Per Share - Computation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018
Basic Earnings per Share from Continuing Operations |  |
Income from continuing operations | $ 250,812 | $ 212,547
Less: income from continuing operations allocated to participating securities | 2,016 | 2,945
Income from continuing operations available to common shareholders | $ 248,796 | $ 209,602
Basic weighted average common shares outstanding (in shares) | 103,543 | 106,835
Basic earnings per share from continuing operations (in dollars per share) | $ 2.40 | $ 1.96
Diluted Earnings per Share from Continuing Operations |  |
Income from continuing operations | $ 250,812 | $ 212,547
Less: income from continuing operations allocated to participating securities | 2,016 | 2,945
Income from continuing operations available to common shareholders | $ 248,796 | $ 209,602
Basic weighted average common shares outstanding (in shares) | 103,543 | 106,835
Effect of dilutive securities - employee stock options (in shares) | 3,540 | 3,813
Diluted weighted average common shares outstanding (in shares) | 107,083 | 110,648
Diluted earnings per share from continuing operations (in dollars per share) | $ 2.32 | $ 1.89

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