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Inventories - Effect of Accounting Changes on Prior Consolidated Statement of Financial Position (Detail) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Inventory | $ 17,206 | $ 18,549 |
Total Current Assets | 65,357 | 64,391 |
Deferred income taxes | 1,829 | 1,869 |
Total Other Assets | 5,404 | 6,031 |
Total Assets | 87,223 | 85,083 |
Liabilities and Stockholders' Equity |  |  |
Other accrued expenses | 1,510 | 2,116 |
Total Current Liabilities | 32,733 | 27,616 |
Total Liabilities | 39,520 | 36,891 |
Retained earnings | 43,552 | 43,836 |
Total Kewaunee Scientific Corporation Stockholders’ Equity | 47,100 | 47,730 | $ 43,461
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 47,703 | 48,192 |
Total Liabilities and Stockholders' Equity | 87,223 | 85,083 |
As Previously Reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Inventory |  | 17,662 |
Total Current Assets |  | 63,504 |
Deferred income taxes |  | 2,031 |
Total Other Assets |  | 6,193 |
Total Assets |  | 84,358 |
Liabilities and Stockholders' Equity |  |  |
Other accrued expenses |  | 2,062 |
Total Current Liabilities |  | 27,562 |
Total Liabilities |  | 36,837 |
Retained earnings |  | 43,165 |
Total Kewaunee Scientific Corporation Stockholders’ Equity |  | 47,059 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 47,521 |
Total Liabilities and Stockholders' Equity |  | 84,358 |
Adjustments |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Inventory | (1,331) |  |
Total Current Assets | (1,331) |  |
Deferred income taxes | 156 |  |
Total Assets | (1,011) |  |
Liabilities and Stockholders' Equity |  |  |
Retained earnings | (1,011) |  |
Total Kewaunee Scientific Corporation Stockholders’ Equity | (1,011) |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (1,011) |  |
Total Liabilities and Stockholders' Equity | $ (1,011) |  |
LIFO/FIFO | Adjustments |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Inventory |  | 887 |
Total Current Assets |  | 887 |
Deferred income taxes |  | (162) |
Total Other Assets |  | (162) |
Total Assets |  | 725 |
Liabilities and Stockholders' Equity |  |  |
Other accrued expenses |  | 54 |
Total Current Liabilities |  | 54 |
Total Liabilities |  | 54 |
Retained earnings |  | 671 |
Total Kewaunee Scientific Corporation Stockholders’ Equity |  | 671 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 671 |
Total Liabilities and Stockholders' Equity |  | $ 725 |

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