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Segment Information - Segment Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers | $ 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
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 2,653,000 | 2,664,000 | 2,487,000
Operating earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 5,221,000 | 2,539,000 | 2,962,000
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,540,000 | 739,000 | 864,000
Net earnings attributable to noncontrolling interest | 187,000 | 238,000 | 158,000 | 54,000 | 558,000 | 156,000 | (31,000) | 86,000 | 637,000 | 769,000 | 248,000
Net earnings (loss) attributable to Kewaunee Scientific Corporation | 1,217,000 | 544,000 | 649,000 | 634,000 | 1,256,000 | (122,000) | (125,000) | 22,000 | 3,044,000 | 1,031,000 | 1,850,000
Segment assets | 68,742,000 |  |  |  | 63,361,000 |  |  |  | 68,742,000 | 63,361,000 | 63,058,000
Expenditures for segment assets |  |  |  |  |  |  |  |  | 2,405,000 | 1,435,000 | 5,247,000
Revenues (excluding intersegment) to customers in foreign countries |  |  |  |  |  |  |  |  | 24,544,000 | 20,593,000 | 18,545,000
Domestic Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 93,519,000 | 83,971,000 | 84,121,000
Intersegment revenues |  |  |  |  |  |  |  |  | 6,722,000 | 5,290,000 | 3,825,000
Depreciation |  |  |  |  |  |  |  |  | 2,523,000 | 2,513,000 | 2,312,000
Operating earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 6,908,000 | 3,400,000 | 5,150,000
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 2,025,000 | 1,349,000 | 1,650,000
Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | 4,883,000 | 2,051,000 | 3,500,000
Segment assets | 52,252,000 |  |  |  | 49,373,000 |  |  |  | 52,252,000 | 49,373,000 | 52,812,000
Expenditures for segment assets |  |  |  |  |  |  |  |  | 2,314,000 | 1,395,000 | 5,070,000
Revenues (excluding intersegment) to customers in foreign countries |  |  |  |  |  |  |  |  | 942,000 | 1,717,000 | 2,663,000
International Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 23,602,000 | 18,876,000 | 15,882,000
Intersegment revenues |  |  |  |  |  |  |  |  | 2,443,000 | 3,051,000 | 1,297,000
Depreciation |  |  |  |  |  |  |  |  | 130,000 | 151,000 | 175,000
Operating earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 2,622,000 | 2,472,000 | 1,008,000
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 786,000 | 779,000 | 188,000
Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 637,000 | 769,000 | 248,000
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | 1,199,000 | 924,000 | 572,000
Segment assets | 16,490,000 |  |  |  | 13,988,000 |  |  |  | 16,490,000 | 13,988,000 | 10,246,000
Expenditures for segment assets |  |  |  |  |  |  |  |  | 91,000 | 40,000 | 177,000
Revenues (excluding intersegment) to customers in foreign countries |  |  |  |  |  |  |  |  | 23,602,000 | 18,876,000 | 15,882,000
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  |  |
Intersegment revenues |  |  |  |  |  |  |  |  | (9,165,000) | (8,341,000) | (5,122,000)
Depreciation |  |  |  |  |  |  |  |  |  |  |
Operating earnings (loss) before income taxes |  |  |  |  |  |  |  |  | (4,309,000) | (3,333,000) | (3,196,000)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,271,000) | (1,389,000) | (974,000)
Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | (3,038,000) | (1,944,000) | (2,222,000)
Segment assets |  |  |  |  |  |  |  |  |  |  |
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |
Revenues (excluding intersegment) to customers in foreign countries |  |  |  |  |  |  |  |  |  |  |

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