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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 138,558 | $ 128,626 | $ 118,828
Depreciation |  |  |  |  |  |  |  |  | 2,702 | 2,592 | 2,615
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 6,746 | 5,739 | 5,385
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 2,126 | 1,862 | 1,745
Net earnings attributable to noncontrolling interest | $ 7 | $ 17 | $ 51 | $ 30 | $ 22 | $ 18 | $ 12 | $ 23 | 105 | 75 | 111
Net earnings (loss) attributable to Kewaunee Scientific Corporation | 1,388 | $ 341 | $ 1,486 | $ 1,300 | 1,337 | $ 830 | $ 695 | $ 940 | 4,515 | 3,802 | 3,529
Segment assets | 80,916 |  |  |  | 72,405 |  |  |  | 80,916 | 72,405 | 69,490
Expenditures for segment assets |  |  |  |  |  |  |  |  | 2,611 | 2,187 | 2,568
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 27,045 | 27,373 | 26,899
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intersegment revenues |  |  |  |  |  |  |  |  | (8,154) | (6,921) | (3,852)
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | (4,982) | (4,470) | (3,498)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,595) | (1,076) | (1,141)
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | (3,387) | (3,394) | (2,357)
Domestic [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 113,081 | 103,047 | 93,098
Intersegment revenues |  |  |  |  |  |  |  |  | 4,463 | 3,612 | 1,433
Depreciation |  |  |  |  |  |  |  |  | 2,478 | 2,375 | 2,399
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 8,221 | 7,471 | 5,810
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 2,522 | 1,834 | 1,794
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | 5,699 | 5,637 | 4,016
Segment assets | 57,246 |  |  |  | 54,030 |  |  |  | 57,246 | 54,030 | 52,723
Expenditures for segment assets |  |  |  |  |  |  |  |  | 2,572 | 1,995 | 2,259
Domestic [Member] | Operating Segments [Member] | Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,568 | 1,794 | 1,169
International [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 25,477 | 25,579 | 25,730
Intersegment revenues |  |  |  |  |  |  |  |  | 3,691 | 3,309 | 2,419
Depreciation |  |  |  |  |  |  |  |  | 224 | 217 | 216
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 3,507 | 2,738 | 3,073
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,199 | 1,104 | 1,092
Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 105 | 75 | 111
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | 2,203 | 1,559 | 1,870
Segment assets | $ 23,670 |  |  |  | $ 18,375 |  |  |  | 23,670 | 18,375 | 16,767
Expenditures for segment assets |  |  |  |  |  |  |  |  | 39 | 192 | 309
International [Member] | Operating Segments [Member] | Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 25,477 | $ 25,579 | $ 25,730

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