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Inventories - Schedule of Impact on the Company's Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Inventory [Line Items]            
Inventories $ 17,097   $ 17,662      
Total Current Assets 60,289   63,504      
Deferred income taxes 1,888   2,031      
Total Assets 80,596   84,358      
Other accrued expenses 2,743   2,062      
Total Current Liabilities 24,036   27,562      
Total Liabilities 31,213   36,837      
Retained earnings 45,888   43,165      
Total Kewaunee Scientific Corporation Stockholders' Equity 48,920 $ 47,940 47,059 $ 44,937 $ 43,769 $ 42,883
Total Stockholders' Equity 49,383   47,521      
Total Liabilities and Stockholders' Equity 80,596   84,358      
Lifo [Member]            
Inventory [Line Items]            
Inventories 16,010   17,662      
Total Current Assets 59,202   63,504      
Deferred income taxes 2,050   2,031      
Total Assets 79,671   84,358      
Other accrued expenses 2,640   2,062      
Total Current Liabilities 23,933   27,562      
Total Liabilities 31,110   36,837      
Retained earnings 45,066   43,165      
Total Kewaunee Scientific Corporation Stockholders' Equity 48,098   47,059      
Total Stockholders' Equity 48,561   47,521      
Total Liabilities and Stockholders' Equity 79,671   84,358      
Adjustments [Member]            
Inventory [Line Items]            
Inventories (1,087)   887      
Total Current Assets (1,087)   887      
Deferred income taxes 162   (162)      
Total Assets (925)   725      
Other accrued expenses (103)   54      
Total Current Liabilities (103)   54      
Total Liabilities (103)   54      
Retained earnings (822)   671      
Total Kewaunee Scientific Corporation Stockholders' Equity (822)   671      
Total Stockholders' Equity (822)   671      
Total Liabilities and Stockholders' Equity (925)   725      
Fifo [Member]            
Inventory [Line Items]            
Inventories 17,097   18,549      
Total Current Assets 60,289   64,391      
Deferred income taxes 1,888   1,869      
Total Assets 80,596   85,083      
Other accrued expenses 2,743   2,116      
Total Current Liabilities 24,036   27,616      
Total Liabilities 31,213   36,891      
Retained earnings 45,888   43,836      
Total Kewaunee Scientific Corporation Stockholders' Equity 48,920   47,730      
Total Stockholders' Equity 49,383   48,192      
Total Liabilities and Stockholders' Equity $ 80,596   $ 85,083