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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