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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers | $ 30,282 | $ 27,754 | $ 30,258 | $ 30,534 | $ 27,052 | $ 26,013 | $ 26,098 | $ 32,003 | $ 118,828 | $ 111,166 | $ 117,121
Depreciation |  |  |  |  |  |  |  |  | 2,615 | 2,549 | 2,653
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 5,385 | 5,986 | 5,221
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,745 | 1,983 | 1,540
Net earnings attributable to noncontrolling interest | 25 | 34 | 26 | 26 | 36 | 21 | 21 | 30 | 111 | 108 | 637
Net earnings (loss) attributable to Kewaunee Scientific Corporation | 609 | $ 484 | $ 1,202 | $ 1,234 | 979 | $ 604 | $ 725 | $ 1,587 | 3,529 | 3,895 | 3,044
Segment assets | 69,490 |  |  |  | 62,717 |  |  |  | 69,490 | 62,717 | 68,742
Expenditures for segment assets |  |  |  |  |  |  |  |  | 2,568 | 2,021 | 2,405
Revenues (excluding intersegment) from customers in foreign countries |  |  |  |  |  |  |  |  | 26,899 | 20,529 | 24,544
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intersegment revenues |  |  |  |  |  |  |  |  | (3,852) | (5,833) | (9,165)
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | (3,498) | (4,003) | (4,309)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,141) | (1,354) | (1,271)
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | (2,357) | (2,649) | (3,038)
Americas Operations [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 93,098 | 91,750 | 93,519
Intersegment revenues |  |  |  |  |  |  |  |  | 1,433 | 3,378 | 6,722
Depreciation |  |  |  |  |  |  |  |  | 2,399 | 2,432 | 2,523
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 5,810 | 7,386 | 6,908
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,794 | 2,482 | 2,025
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | 4,016 | 4,904 | 4,883
Segment assets | 52,723 |  |  |  | 47,890 |  |  |  | 52,723 | 47,890 | 52,252
Expenditures for segment assets |  |  |  |  |  |  |  |  | 2,259 | 1,822 | 2,314
Revenues (excluding intersegment) from customers in foreign countries |  |  |  |  |  |  |  |  | 1,169 | 1,113 | 942
International [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 25,730 | 19,416 | 23,602
Intersegment revenues |  |  |  |  |  |  |  |  | 2,419 | 2,455 | 2,443
Depreciation |  |  |  |  |  |  |  |  | 216 | 117 | 130
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 3,073 | 2,603 | 2,622
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,092 | 855 | 786
Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 111 | 108 | 637
Net earnings (loss) attributable to Kewaunee Scientific Corporation |  |  |  |  |  |  |  |  | 1,870 | 1,640 | 1,199
Segment assets | $ 16,767 |  |  |  | $ 14,827 |  |  |  | 16,767 | 14,827 | 16,490
Expenditures for segment assets |  |  |  |  |  |  |  |  | 309 | 199 | 91
Revenues (excluding intersegment) from customers in foreign countries |  |  |  |  |  |  |  |  | $ 25,730 | $ 19,416 | $ 23,602

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