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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Apr. 30, 2016 USD ($) | Jan. 31, 2016 USD ($) | Oct. 31, 2015 USD ($) | Jul. 31, 2015 USD ($) | Apr. 30, 2017 USD ($) Store shares | Apr. 30, 2016 USD ($) shares | Apr. 30, 2015 USD ($) shares | Jun. 24, 2013 | May 31, 2013 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 34,579,000 | $ 30,371,000 | $ 36,329,000 | $ 37,279,000 | $ 34,090,000 | $ 32,410,000 | $ 31,037,000 | $ 31,089,000 | $ 138,558,000 | $ 128,626,000 | $ 118,828,000 |  |
Unbilled receivables | 450,000 |  |  |  | 323,000 |  |  |  | 450,000 | 323,000 |  |  |
Property plant and equipment impairment charges |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Assets held in trust account for non-qualified benefit plans included in other assets | 3,748,000 |  |  |  | 3,867,000 |  |  |  | 3,748,000 | 3,867,000 |  |  |
Cash surrender value of life insurance policies included in other assets | 75,000 |  |  |  | 62,000 |  |  |  | 75,000 | 62,000 |  |  |
Retainage included in accounts receivable | $ 2,839,000 |  |  |  | 1,562,000 |  |  |  | $ 2,839,000 | $ 1,562,000 |  |  |
Total accounts receivable |  |  |  |  |  |  |  |  | 25.00% | 24.00% |  |  |
Research and development costs |  |  |  |  |  |  |  |  | $ 1,163,000 | $ 1,167,000 | 936,000 |  |
Advertising costs |  |  |  |  |  |  |  |  | $ 352,000 | $ 311,000 | $ 404,000 |  |
Anti-dilutive options exclude from computation of earning per share | shares |  |  |  |  |  |  |  |  | 39,200 | 110,100 | 80,800 |  |
Stock options granted | shares |  |  |  |  |  |  |  |  | 45,200 | 40,200 | 45,800 |  |
May 1, 2013 to August 1, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding advances under the long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding advances under the long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | 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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding advances under the long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  |  |
Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of domestic customers | Store |  |  |  |  |  |  |  |  | 2 |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales percentage |  |  |  |  |  |  |  |  | 38.00% | 40.00% | 36.00% |  |
Number of domestic customers | Store |  |  |  |  |  |  |  |  | 3 |  |  |  |
Kewaunee Labway Asia Pte. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  | 49.00% |
Kewaunee Labway India Pvt. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries | 90.00% |  |  |  |  |  |  |  | 90.00% |  |  |  |
Kewaunee Scientific Corporation India Pvt. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Kewaunee Scientific Corporation Singapore Pte. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Kewaunee Scientific Corporation China [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets | $ 12,268,000 |  |  |  | $ 12,298,000 |  |  |  | $ 12,268,000 | $ 12,298,000 |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 25,477,000 | $ 25,579,000 | $ 25,730,000 |  |

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