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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Income Statement [Abstract]    
Net Sales $ 33,881 $ 37,279
Costs of products sold 27,060 30,140
Gross profit 6,821 7,139
Operating expenses 5,133 5,078
Operating earnings 1,688 2,061
Other income 168 119
Interest expense (59) (80)
Earnings before income taxes 1,797 2,100
Income tax expense 605 770
Net earnings 1,192 1,330
Less: net earnings attributable to the noncontrolling interest 44 30
Net earnings attributable to Kewaunee Scientific Corporation $ 1,148 $ 1,300
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders    
Basic $ 0.42 $ 0.48
Diluted $ 0.42 $ 0.48
Weighted average number of common shares outstanding    
Basic 2,712 2,693
Diluted 2,755 2,707