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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 01, 2018 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 34,748,000 | $ 32,372,000 | $ 37,278,000 | $ 42,152,000 | $ 44,508,000 | $ 38,190,000 | $ 41,471,000 | $ 33,881,000 | $ 146,550,000 | $ 158,050,000
Unbilled receivables |  | 4,589,000 |  |  |  | 1,007,000 |  |  |  | 4,589,000 | 1,007,000
Property plant and equipment impairment charges |  |  |  |  |  |  |  |  |  | 0 | 0
Retainage included in accounts receivable |  | 1,810,000 |  |  |  | 2,724,000 |  |  |  | $ 1,810,000 | $ 2,724,000
Total accounts receivable |  |  |  |  |  |  |  |  |  | 30.00% | 31.00%
Research and development costs |  |  |  |  |  |  |  |  |  | $ 1,550,000 | $ 1,537,000
Advertising costs |  |  |  |  |  |  |  |  |  | $ 268,000 | $ 395,000
Anti-dilutive options exclude from computation of earning per share |  |  |  |  |  |  |  |  |  | 31,015 | 0
Stock options granted |  |  |  |  |  |  |  |  |  | 0 | 0
Retained earnings |  | 43,552,000 |  |  |  | 43,836,000 |  |  |  | $ 43,552,000 | $ 43,836,000
Non-service components of net benefit cost |  |  |  |  |  |  |  |  |  | 295,000 | 694,000
Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net assets |  | 17,887,000 |  |  |  | 15,762,000 |  |  |  | 17,887,000 | 15,762,000
Net sales |  |  |  |  |  |  |  |  |  | 29,964,000 | $ 43,456,000
May 1, 2013 to August 1, 2017 |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding advances under the long-term debt |  | $ 3,450,000 |  |  |  |  |  |  |  | $ 3,450,000 |
Interest rate swap, conversion rate |  | 4.875% |  |  |  |  |  |  |  | 4.875% |
Interest rate swap, beginning date of conversion |  |  |  |  |  |  |  |  |  | May 01, 2013 |
Interest rate swap, ending date of conversion |  |  |  |  |  |  |  |  |  | Aug. 01, 2017 |
August 1, 2017 to May 1, 2020 |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding advances under the long-term debt |  | $ 2,600,000 |  |  |  |  |  |  |  | $ 2,600,000 |
Interest rate swap, conversion rate |  | 4.37% |  |  |  |  |  |  |  | 4.37% |
Interest rate swap, beginning date of conversion |  |  |  |  |  |  |  |  |  | Aug. 01, 2017 |
Interest rate swap, ending date of conversion |  |  |  |  |  |  |  |  |  | May 01, 2020 |
November 3, 2014 to May 1, 2020 |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding advances under the long-term debt |  | $ 1,218,000 |  |  |  |  |  |  |  | $ 1,218,000 |
Interest rate swap, conversion rate |  | 3.07% |  |  |  |  |  |  |  | 3.07% |
Interest rate swap, beginning date of conversion |  |  |  |  |  |  |  |  |  | Nov. 03, 2014 |
Interest rate swap, ending date of conversion |  |  |  |  |  |  |  |  |  | May 01, 2020 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock units granted (in shares) |  |  |  |  |  |  |  |  |  | 19,738 | 23,907
Customer Concentration Risk | Sales Revenue, Segment |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales percentage |  |  |  |  |  |  |  |  |  | 34.00% | 33.00%
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-service components of net benefit cost |  |  |  |  |  |  |  |  |  | $ 295,000 |
ASU 2014-09 | Revenue Guidance Adjustments |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | (1,226,000) |
Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets held in trust account for non-qualified benefit plans included in other assets |  | $ 3,057,000 |  |  |  | 4,050,000 |  |  |  | 3,057,000 | $ 4,050,000
Cash surrender value of life insurance policies included in other assets |  | $ 76,000 |  |  |  | $ 65,000 |  |  |  | $ 76,000 | $ 65,000
Kewaunee Labway Asia Pte. Ltd. |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries |  | 100.00% |  |  |  |  |  |  |  | 100.00% |
Kewaunee Labway India Pvt. Ltd. |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries |  | 95.00% |  |  |  |  |  |  |  | 95.00% |
Kewaunee Scientific Corporation Singapore Pte. Ltd. |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries |  | 100.00% |  |  |  |  |  |  |  | 100.00% |
Koncepo Scientech International |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries |  | 80.00% |  |  |  |  |  |  |  | 80.00% |
Kewaunee Scientific Corporation China |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries |  | 100.00% |  |  |  |  |  |  |  | 100.00% |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  | $ (1,011,000) |  |  |  |  |  |  |  | $ (1,011,000) |
Restatement Adjustment | Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-service components of net benefit cost | $ (694,000) |  |  |  |  |  |  |  |  |  |
Other (income)/expense, net | $ 694,000 |  |  |  |  |  |  |  |  | $ 295,000 |

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