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Consolidated Condensed Statements of Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2019
Feb. 29, 2020
Feb. 28, 2019
Income Statement [Abstract]      
Income (loss) from discontinued operations, income tax expense (benefit) $ 772 $ (107) $ 768