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Inventories - Schedule of Impact on the Company's Condensed Consolidated Statements of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Jan. 31, 2019
Jan. 31, 2018
Inventory [Line Items]                
Cost of products sold $ 27,142     $ 29,791     $ 91,325 $ 90,411
Income tax expense 20     1,581     803 3,164
Net earnings 15     948     2,885 3,905
Net earnings attributable to Kewaunee Scientific Corporation $ (22) $ 1,414 $ 1,407 $ 913 $ 1,724 $ 1,148 $ 2,799 $ 3,785
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders                
Basic (in dollars per share) $ (0.01)     $ 0.33     $ 1.02 $ 1.39
Diluted (in dollars per share) $ (0.01)     $ 0.32     $ 1.00 $ 1.36
As Reported                
Inventory [Line Items]                
Cost of products sold $ 27,093     $ 29,836     $ 91,476 $ 90,456
Income tax expense 32     1,566     766 3,149
Net earnings 52     918     2,771 3,875
Net earnings attributable to Kewaunee Scientific Corporation $ 15     $ 883     $ 2,685 $ 3,755
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders                
Basic (in dollars per share) $ 0.00     $ 0.32     $ 0.98 $ 1.38
Diluted (in dollars per share) $ 0.00     $ 0.31     $ 0.96 $ 1.35
Adjustments                
Inventory [Line Items]                
Cost of products sold $ (49)     $ (45)     $ 151 $ (45)
Income tax expense 12     15     (37) 15
Net earnings 37     30     (114) 30
Net earnings attributable to Kewaunee Scientific Corporation $ 37     $ 30     $ (114) $ 30
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders                
Basic (in dollars per share) $ 0.01     $ 0.01     $ (0.04) $ 0.01
Diluted (in dollars per share) $ 0.01     $ 0.01     $ (0.04) $ 0.01