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Consolidated Condensed Statements of Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Income Statement [Abstract]        
Tax expense (benefit) from discontinued operations $ (6,157) $ 2,109 $ 34,946 $ 13,101