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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Income Statement [Abstract]    
Net Sales $ 37,279 $ 31,089
Costs of products sold 30,140 25,246
Gross profit 7,139 5,843
Operating expenses 5,078 4,319
Operating earnings 2,061 1,524
Other income 119 102
Interest expense (80) (92)
Earnings before income taxes 2,100 1,534
Income tax expense 770 571
Net earnings 1,330 963
Less: net earnings attributable to the noncontrolling interest 30 23
Net earnings attributable to Kewaunee Scientific Corporation $ 1,300 $ 940
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders    
Basic $ 0.48 $ 0.36
Diluted $ 0.48 $ 0.35
Weighted average number of common shares outstanding    
Basic 2,693 2,630
Diluted 2,707 2,659