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Consolidated Quarterly Data (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 30,282 $ 27,754 $ 30,258 $ 30,534 $ 27,052 $ 26,013 $ 26,098 $ 32,003 $ 118,828 $ 111,166 $ 117,121
Gross profit 5,340 4,456 5,822 6,148 5,852 4,711 4,893 6,576 21,766 22,032 22,258
Net earnings 634 518 1,228 1,260 1,015 625 746 1,617 3,640 4,003 3,681
Less: net earnings attributable to the noncontrolling interest 25 34 26 26 36 21 21 30 111 108 637
Net earnings attributable to Kewaunee Scientific Corporation $ 609 $ 484 $ 1,202 $ 1,234 $ 979 $ 604 $ 725 $ 1,587 $ 3,529 $ 3,895 $ 3,044
Net earnings per share attributable to Kewaunee Scientific Corporation                      
Basic $ 0.23 $ 0.18 $ 0.46 $ 0.47 $ 0.37 $ 0.23 $ 0.28 $ 0.61 $ 1.34 $ 1.49 $ 1.18
Diluted 0.23 0.18 0.45 0.47 0.37 0.22 0.28 0.61 1.33 1.48 1.17
Cash dividends per share $ 0.12 $ 0.12 $ 0.12 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.47 $ 0.44 $ 0.40