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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2015 USD ($) | Jan. 31, 2015 USD ($) | Oct. 31, 2014 USD ($) | Jul. 31, 2014 USD ($) | Apr. 30, 2014 USD ($) | Jan. 31, 2014 USD ($) | Oct. 31, 2013 USD ($) | Jul. 31, 2013 USD ($) | Apr. 30, 2015 USD ($) Store shares | Apr. 30, 2014 USD ($) shares | Apr. 30, 2013 USD ($) shares | Jun. 24, 2013 | May. 31, 2013 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 30,282,000 | $ 27,754,000 | $ 30,258,000 | $ 30,534,000 | $ 27,052,000 | $ 26,013,000 | $ 26,098,000 | $ 32,003,000 | $ 118,828,000 | $ 111,166,000 | $ 117,121,000 |  |
Unbilled receivables | 545,000 |  |  |  | 256,000 |  |  |  | 545,000 | 256,000 |  |  |
Property plant and equipment impairment charges |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Assets held in trust account for non-qualified benefit plans included in other assets | 3,683,000 |  |  |  | 3,313,000 |  |  |  | 3,683,000 | 3,313,000 |  |  |
Cash surrender value of life insurance policies included in other assets | 47,000 |  |  |  | 88,000 |  |  |  | 47,000 | 88,000 |  |  |
Retainage included in accounts receivable | $ 2,231,000 |  |  |  | 2,490,000 |  |  |  | $ 2,231,000 | $ 2,490,000 |  |  |
Number of Americas dealers | Store |  |  |  |  |  |  |  |  | 2 |  |  |  |
Total accounts receivable |  |  |  |  |  |  |  |  | 9.00% | 22.00% |  |  |
Research and development costs |  |  |  |  |  |  |  |  | $ 936,000 | $ 842,000 | 872,000 |  |
Advertising costs |  |  |  |  |  |  |  |  | $ 404,000 | $ 377,000 | $ 395,000 |  |
Antidilutive options exclude from computation of earning per share | shares |  |  |  |  |  |  |  |  | 80,800 | 0 | 72,850 |  |
Stock options granted | shares |  |  |  |  |  |  |  |  | 45,800 | 46,600 | 40,000 |  |
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 |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales percentage |  |  |  |  |  |  |  |  | 12.00% | 9.00% | 11.00% |  |
Customer Concentration Risk [Member] | Sales Revenue, Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales percentage |  |  |  |  |  |  |  |  | 24.00% | 24.00% | 14.00% |  |
Kewaunee Labway Asia Pte. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
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% |  |  | 49.00% |
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 | $ 9,494,000 |  |  |  | $ 8,864,000 |  |  |  | $ 9,494,000 | $ 8,864,000 |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 25,730,000 | $ 19,416,000 | $ 23,602,000 |  |

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