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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 128,626 | $ 118,828 | $ 111,166
Depreciation |  |  |  |  |  |  |  |  | 2,592 | 2,615 | 2,549
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 5,739 | 5,385 | 5,986
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,862 | 1,745 | 1,983
Net earnings attributable to noncontrolling interest | $ 22 | $ 18 | $ 12 | $ 23 | $ 25 | $ 34 | $ 26 | $ 26 | 75 | 111 | 108
Net earnings (loss) attributable to Kewaunee Scientific Corporation | 1,337 | $ 830 | $ 695 | $ 940 | 609 | $ 484 | $ 1,202 | $ 1,234 | 3,802 | 3,529 | 3,895
Segment assets | 72,405 |  |  |  | 69,490 |  |  |  | 72,405 | 69,490 | 62,717
Expenditures for segment assets |  |  |  |  |  |  |  |  | 2,187 | 2,568 | 2,021
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 27,373 | 26,899 | 20,529
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intersegment revenues |  |  |  |  |  |  |  |  | (6,921) | (3,852) | (5,833)
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | (4,470) | (3,498) | (4,003)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,076) | (1,141) | (1,354)
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | (3,394) | (2,357) | (2,649)
Domestic [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 103,047 | 93,098 | 91,750
Intersegment revenues |  |  |  |  |  |  |  |  | 3,612 | 1,433 | 3,378
Depreciation |  |  |  |  |  |  |  |  | 2,375 | 2,399 | 2,432
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 7,471 | 5,810 | 7,386
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,834 | 1,794 | 2,482
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | 5,637 | 4,016 | 4,904
Segment assets | 54,030 |  |  |  | 52,723 |  |  |  | 54,030 | 52,723 | 47,890
Expenditures for segment assets |  |  |  |  |  |  |  |  | 1,995 | 2,259 | 1,822
Domestic [Member] | Operating Segments [Member] | Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,794 | 1,169 | 1,113
International [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 25,579 | 25,730 | 19,416
Intersegment revenues |  |  |  |  |  |  |  |  | 3,309 | 2,419 | 2,455
Depreciation |  |  |  |  |  |  |  |  | 217 | 216 | 117
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 2,738 | 3,073 | 2,603
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,104 | 1,092 | 855
Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 75 | 111 | 108
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | 1,559 | 1,870 | 1,640
Segment assets | $ 18,375 |  |  |  | $ 16,767 |  |  |  | 18,375 | 16,767 | 14,827
Expenditures for segment assets |  |  |  |  |  |  |  |  | 192 | 309 | 199
International [Member] | Operating Segments [Member] | Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 25,579 | $ 25,730 | $ 19,416

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