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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, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 34,579 $ 30,371 $ 36,329 $ 37,279 $ 34,090 $ 32,410 $ 31,037 $ 31,089 $ 138,558 $ 128,626 $ 118,828
Gross profit 7,332 5,032 7,104 7,139 6,845 5,488 5,532 5,843 26,607 23,708 21,766
Net earnings 1,395 358 1,537 1,330 1,359 848 707 963 4,620 3,877 3,640
Less: net earnings attributable to the noncontrolling interest 7 17 51 30 22 18 12 23 105 75 111
Net earnings attributable to Kewaunee Scientific Corporation 1,388 341 1,486 1,300 1,337 830 695 940 4,515 3,802 3,529
Net earnings per share attributable to Kewaunee Scientific Corporation                      
Net sales 34,579 30,371 36,329 37,279 34,090 32,410 31,037 31,089 138,558 128,626 118,828
Gross profit 7,332 5,032 7,104 7,139 6,845 5,488 5,532 5,843 26,607 23,708 21,766
Net earnings 1,395 358 1,537 1,330 1,359 848 707 963 4,620 3,877 3,640
Less: net earnings attributable to the noncontrolling interest 7 17 51 30 22 18 12 23 105 75 111
Net earnings attributable to Kewaunee Scientific Corporation $ 1,388 $ 341 $ 1,486 $ 1,300 $ 1,337 $ 830 $ 695 $ 940 $ 4,515 $ 3,802 $ 3,529
Basic $ 0.51 $ 0.13 $ 0.55 $ 0.48 $ 0.50 $ 0.31 $ 0.26 $ 0.36 $ 1.67 $ 1.43 $ 1.34
Diluted 0.51 0.13 0.54 0.48 0.50 0.31 0.26 0.35 1.66 1.42 1.33
Cash dividends paid per share $ 0.15 $ 0.15 $ 0.15 $ 0.13 $ 0.13 $ 0.13 $ 0.13 $ 0.12 $ 0.58 $ 0.51 $ 0.47