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Consolidated Statements Of Operations And Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Income Statement [Abstract]        
Tax benefit on realized gains $ 0 $ 0 $ 0 $ 0
Tax benefit on discontinued operations 3,067 1,644 4,672 3,201
Tax benefit on unrealized gains $ 0 $ 0 $ 0 $ 6