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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net income $ 22,281 $ 21,661
Other comprehensive income, net of tax:    
Change in pension benefits, net of deferred taxes of $(156) and $(173), respectively 244 270
Total Comprehensive Income $ 22,525 $ 21,931