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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, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 34,090 $ 32,410 $ 31,037 $ 31,089 $ 30,282 $ 27,754 $ 30,258 $ 30,534 $ 128,626 $ 118,828 $ 111,166
Gross profit 6,845 5,488 5,532 5,843 5,340 4,456 5,822 6,148 23,708 21,766 22,032
Net earnings 1,359 848 707 963 634 518 1,228 1,260 3,877 3,640 4,003
Less: net earnings attributable to the noncontrolling interest 22 18 12 23 25 34 26 26 75 111 108
Net earnings attributable to Kewaunee Scientific Corporation 1,337 830 695 940 609 484 1,202 1,234 3,802 3,529 3,895
Net earnings per share attributable to Kewaunee Scientific Corporation                      
Net sales 34,090 32,410 31,037 31,089 30,282 27,754 30,258 30,534 128,626 118,828 111,166
Gross profit 6,845 5,488 5,532 5,843 5,340 4,456 5,822 6,148 23,708 21,766 22,032
Net earnings 1,359 848 707 963 634 518 1,228 1,260 3,877 3,640 4,003
Less: net earnings attributable to the noncontrolling interest 22 18 12 23 25 34 26 26 75 111 108
Net earnings attributable to Kewaunee Scientific Corporation $ 1,337 $ 830 $ 695 $ 940 $ 609 $ 484 $ 1,202 $ 1,234 $ 3,802 $ 3,529 $ 3,895
Basic $ 0.50 $ 0.31 $ 0.26 $ 0.36 $ 0.23 $ 0.18 $ 0.46 $ 0.47 $ 1.43 $ 1.34 $ 1.49
Diluted 0.50 0.31 0.26 0.35 0.23 0.18 0.45 0.47 1.42 1.33 1.48
Cash dividends paid per share $ 0.13 $ 0.13 $ 0.13 $ 0.12 $ 0.12 $ 0.12 $ 0.12 $ 0.11 $ 0.51 $ 0.47 $ 0.44