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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Income Statement [Abstract]        
Net sales $ 41,471 $ 36,329 $ 75,352 $ 73,608
Costs of products sold 33,560 29,225 60,620 59,365
Gross profit 7,911 7,104 14,732 14,243
Operating expenses 5,256 4,816 10,389 9,894
Operating earnings 2,655 2,288 4,343 4,349
Other income 177 119 345 238
Interest expense (89) (78) (148) (158)
Earnings before income taxes 2,743 2,329 4,540 4,429
Income tax expense 978 792 1,583 1,562
Net earnings 1,765 1,537 2,957 2,867
Less: net earnings attributable to the noncontrolling interest 41 51 85 81
Net earnings attributable to Kewaunee Scientific Corporation $ 1,724 $ 1,486 $ 2,872 $ 2,786
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders        
Basic $ 0.64 $ 0.55 $ 1.06 $ 1.03
Diluted $ 0.62 $ 0.54 $ 1.04 $ 1.02
Weighted average number of common shares outstanding        
Basic 2,717 2,706 2,715 2,699
Diluted 2,776 2,729 2,766 2,718