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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Basic Earnings per Share from Continuing Operations    
Income from continuing operations $ 138,091 $ 106,198
Less: income from continuing operations allocated to participating securities 2,727 1,742
Income from continuing operations available to common shareholders $ 135,364 $ 104,456
Basic weighted average common shares outstanding (shares) 104,483 110,597
Basic earnings per common share:    
Basic earnings per share from continuing operations (dollars per share) $ 1.29 $ 0.94
Diluted Earnings per Share from Continuing Operations    
Income from continuing operations $ 138,091 $ 106,198
Less: income from continuing operations allocated to participating securities 2,727 1,742
Income from continuing operations available to common shareholders $ 135,364 $ 104,456
Basic weighted average common shares outstanding (shares) 104,483 110,597
Effect of dilutive securities - employee stock options (shares) 2,631 1,632
Diluted weighted average common shares outstanding (shares) 107,114 112,229
Diluted earnings per share:    
Diluted earnings per share from continuing operations (dollars per share) $ 1.26 $ 0.93