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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2014 Store | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2014 May 1, 2013 to August 1, 2017 [Member] | May 31, 2013 May 1, 2013 to August 1, 2017 [Member] | Apr. 30, 2014 August 1, 2017 to May 1, 2020 [Member] | May 31, 2013 August 1, 2017 to May 1, 2020 [Member] | Apr. 30, 2014 November 3, 2014 to May 1, 2020 [Member] | May 31, 2013 November 3, 2014 to May 1, 2020 [Member] | Apr. 30, 2014 Revenue [Member] | Apr. 30, 2013 Revenue [Member] | Apr. 30, 2012 Revenue [Member] | Apr. 30, 2014 Subsidiaries [Member] | Apr. 30, 2013 Subsidiaries [Member] | Apr. 30, 2012 Subsidiaries [Member] | Apr. 30, 2014 Kewaunee Labway Asia Pte. Ltd. [Member] | Apr. 30, 2014 Kewaunee Labway India Pvt. Ltd. [Member] | Apr. 30, 2014 Kewaunee Scientific Corporation India Pvt. Ltd. [Member] | Apr. 30, 2014 Kewaunee Scientific Corporation Singapore Pte. Ltd. [Member] | Apr. 30, 2014 Kewaunee Scientific Corporation China [Member]
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 90.00% | 100.00% | 100.00% | 100.00%
Net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,864,000 | $ 11,189,000 |  |  |  |  |  |
Net sales | 27,052,000 | 26,013,000 | 26,098,000 | 32,003,000 | 31,803,000 | 27,450,000 | 31,185,000 | 26,683,000 | 111,166,000 | 117,121,000 | 102,847,000 |  |  |  |  |  |  |  |  |  | 19,416,000 | 23,602,000 | 18,876,000 |  |  |  |  |
Property plant and equipment impairment charges |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held in trust account for non-qualified benefit plans included in other assets | 3,313,000 |  |  |  | 4,077,000 |  |  |  | 3,313,000 | 4,077,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash surrender value of life insurance policies included in other assets | 88,000 |  |  |  | 96,000 |  |  |  | 88,000 | 96,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retainage included in accounts receivable | 2,490,000 |  |  |  | 2,659,000 |  |  |  | 2,490,000 | 2,659,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue percentage from national stocking distributor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% | 11.00% | 12.00% |  |  |  |  |  |  |  |
Number of domestic dealers |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 24.00% | 14.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total accounts receivable |  |  |  |  |  |  |  |  | 22.00% | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development costs |  |  |  |  |  |  |  |  | 842,000 | 872,000 | 941,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  |  |  |  |  | 377,000 | 395,000 | 344,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding advances under the long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,450,000 |  | $ 2,600,000 |  | $ 1,218,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate swap, conversion rate |  |  |  |  |  |  |  |  |  |  |  | 4.875% |  | 4.37% |  | 3.07% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap, beginning date of conversion |  |  |  |  |  |  |  |  |  |  |  | May 01, 2013 |  | Aug. 01, 2017 |  | Nov. 03, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap, ending date of conversion |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2017 |  | May 01, 2020 |  | May 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive options exclude from computation of earning per share |  |  |  |  |  |  |  |  | 0 | 72,850 | 253,050 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted |  |  |  |  |  |  |  |  | 46,600 | 40,000 | 55,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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