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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jun. 30, 2010 | Jul. 31, 2009 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  | $ 31,803,000 | $ 27,450,000 | $ 31,185,000 | $ 26,683,000 | $ 28,990,000 | $ 21,574,000 | $ 25,962,000 | $ 26,321,000 | $ 117,121,000 | $ 102,847,000 | $ 100,003,000
Equipment under capital lease |  |  |  |  |  |  | 307,000 |  |  |  |  | 307,000 |
Property plant and equipment impairment charges |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Assets held in trust account for non-qualified benefit plans included in other assets |  |  | 4,077,000 |  |  |  | 3,454,000 |  |  |  | 4,077,000 | 3,454,000 |
Cash surrender value of life insurance policies included in other assets |  |  | 96,000 |  |  |  | 83,000 |  |  |  | 96,000 | 83,000 |
Retainage included in accounts receivable |  |  | 2,659,000 |  |  |  | 2,015,000 |  |  |  | 2,659,000 | 2,015,000 |
Research and development costs |  |  |  |  |  |  |  |  |  |  | 872,000 | 941,000 | 1,181,000
Advertising costs |  |  |  |  |  |  |  |  |  |  | 395,000 | 344,000 | 398,000
Interest rate swap, conversion rate | 4.875% | 3.90% |  |  |  |  |  |  |  |  |  |  |
Interest rate swap, beginning date of conversion | Aug. 02, 2010 | Aug. 03, 2009 |  |  |  |  |  |  |  |  |  |  |
Interest rate swap, ending date of conversion |  | Aug. 01, 2012 |  |  |  |  |  |  |  |  |  |  |
Antidilutive options exclude from computation of earning per share |  |  |  |  |  |  |  |  |  |  | 72,850 | 253,050 | 118,900
Stock options granted |  |  |  |  |  |  |  |  |  |  | 40,000 | 55,000 | 136,400
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding advances under the revolving credit facility |  | 2,000,000 | 15,000,000 |  |  |  |  |  |  |  | 15,000,000 |  |
VWR International LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue percentage from national stocking distributor |  |  |  |  |  |  |  |  |  |  | 11.00% | 12.00% | 14.00%
Kewaunee Labway Asia Pte. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest in subsidiaries |  |  | 51.00% |  |  |  |  |  |  |  | 51.00% |  |
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% |  |
Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets |  |  | 11,189,000 |  |  |  | 9,648,000 |  |  |  | 11,189,000 | 9,648,000 |
Net sales |  |  |  |  |  |  |  |  |  |  | $ 23,602,000 | $ 18,876,000 | $ 15,882,000

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 2 -Paragraph 12, 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 86 -Paragraph 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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