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Cash Flow (Supplemental Disclosures Of Cash Flow Information) (Details) - USD ($)
$ in Thousands
6 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Supplemental Cash Flow Information [Abstract]    
Cash paid during the period for interest $ 288 $ 241
Cash paid during the period for income taxes $ 11,800 $ 15,563