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Segments - Financial Highlights by Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 437,789 | $ 504,177 | $ 784,672 | $ 1,000,375
Net income (loss) attributable to Korn Ferry | 27,778 | 42,804 | (3,055) | 85,755
Net income attributable to noncontrolling interest | 300 | 228 | 278 | 927
Other income, net | (277) | (1,133) | (11,439) | (2,959)
Interest expense, net | 7,494 | 4,210 | 14,388 | 8,267
Income tax provision | 12,877 | 15,760 | 4,205 | 30,213
Operating income (loss) | 48,172 | 61,869 | 4,377 | 122,203
Depreciation and amortization | 15,298 | 12,715 | 30,333 | 25,492
Other income (loss), net | 277 | 1,133 | 11,439 | 2,959
EBITDA | 63,747 | 75,717 | 46,149 | 150,654
Integration/acquisition costs |  | 2,615 | 737 | 2,615
Restructuring charges, net | 2,407 |  | 29,894 |
Adjusted EBITDA | 66,154 | 78,332 | 76,780 | 153,269
Fee Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 435,439 | 492,389 | 779,536 | 976,938
Operating Segments | Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 127,051 | 148,198 | 226,641 | 289,534
Operating income (loss) | 14,621 | 9,826 | 3,694 | 21,609
Depreciation and amortization | 4,063 | 4,357 | 8,072 | 8,771
Other income (loss), net | 336 | 386 | 1,124 | 911
EBITDA | 19,020 | 14,569 | 12,890 | 31,291
Restructuring charges, net | 1,143 |  | 13,877 |
Adjusted EBITDA | 20,163 | 14,569 | 26,767 | 31,291
Operating Segments | Digital |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 75,038 | 65,724 | 131,060 | 123,708
Operating income (loss) | 15,823 | 18,565 | 13,196 | 32,573
Depreciation and amortization | 7,005 | 3,685 | 13,731 | 7,324
Other income (loss), net | 202 | 134 | 620 | 335
EBITDA | 23,030 | 22,384 | 27,547 | 40,232
Integration/acquisition costs |  |  | 556 |
Restructuring charges, net | 54 |  | 2,924 |
Adjusted EBITDA | 23,084 | 22,384 | 31,027 | 40,232
Operating Segments | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 148,599 | 191,959 | 269,485 | 389,972
Operating income (loss) | 25,628 | 41,229 | 13,318 | 86,865
Depreciation and amortization | 1,523 | 1,963 | 3,092 | 3,994
Other income (loss), net | 195 | 846 | 9,830 | 2,070
EBITDA | 27,346 | 44,038 | 26,240 | 92,929
Restructuring charges, net | 882 |  | 10,042 |
Adjusted EBITDA | 28,228 | 44,038 | 36,282 | 92,929
Operating Segments | Executive Search | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 91,609 | 117,077 | 161,465 | 232,523
Operating income (loss) | 20,491 | 28,124 | 14,756 | 58,446
Depreciation and amortization | 716 | 869 | 1,446 | 1,770
Other income (loss), net | (9) | 637 | 9,333 | 1,777
EBITDA | 21,198 | 29,630 | 25,535 | 61,993
Restructuring charges, net | (12) |  | 963 |
Adjusted EBITDA | 21,186 | 29,630 | 26,498 | 61,993
Operating Segments | Executive Search | EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 31,714 | 40,441 | 61,909 | 87,753
Operating income (loss) | 1,509 | 6,511 | (4,710) | 13,822
Depreciation and amortization | 355 | 450 | 717 | 906
Other income (loss), net | 31 | 107 | 50 | 119
EBITDA | 1,895 | 7,068 | (3,943) | 14,847
Restructuring charges, net | 922 |  | 8,470 |
Adjusted EBITDA | 2,817 | 7,068 | 4,527 | 14,847
Operating Segments | Executive Search | Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 20,820 | 26,168 | 38,160 | 53,836
Operating income (loss) | 3,253 | 5,803 | 4,114 | 12,796
Depreciation and amortization | 250 | 329 | 525 | 675
Other income (loss), net | 166 | 72 | 392 | 87
EBITDA | 3,669 | 6,204 | 5,031 | 13,558
Restructuring charges, net | (28) |  | 204 |
Adjusted EBITDA | 3,641 | 6,204 | 5,235 | 13,558
Operating Segments | Executive Search | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 4,456 | 8,273 | 7,951 | 15,860
Operating income (loss) | 375 | 791 | (842) | 1,801
Depreciation and amortization | 202 | 315 | 404 | 643
Other income (loss), net | 7 | 30 | 55 | 87
EBITDA | 584 | 1,136 | (383) | 2,531
Restructuring charges, net |  |  | 405 |
Adjusted EBITDA | 584 | 1,136 | 22 | 2,531
Operating Segments | RPO & Professional Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 87,101 | 98,296 | 157,486 | 197,161
Operating income (loss) | 12,502 | 15,094 | 14,667 | 30,135
Depreciation and amortization | 945 | 990 | 1,885 | 1,982
Other income (loss), net | 24 | 54 | 220 | 128
EBITDA | 13,471 | 16,138 | 16,772 | 32,245
Restructuring charges, net | 328 |  | 3,051 |
Adjusted EBITDA | 13,799 | 16,138 | 19,823 | 32,245
Operating Segments | Fee Revenue | Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 126,685 | 144,036 | 226,003 | 281,578
Operating Segments | Fee Revenue | Digital |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 75,043 | 65,724 | 131,016 | 123,708
Operating Segments | Fee Revenue | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 148,060 | 187,855 | 268,203 | 381,054
Operating Segments | Fee Revenue | Executive Search | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 91,168 | 113,818 | 160,483 | 225,540
Operating Segments | Fee Revenue | Executive Search | EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 31,629 | 39,821 | 61,710 | 86,351
Operating Segments | Fee Revenue | Executive Search | Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 20,807 | 25,944 | 38,059 | 53,306
Operating Segments | Fee Revenue | Executive Search | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 4,456 | 8,272 | 7,951 | 15,857
Operating Segments | Fee Revenue | RPO & Professional Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 85,651 | 94,774 | 154,314 | 190,598
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (20,402) | (22,845) | (40,498) | (48,979)
Depreciation and amortization | 1,762 | 1,720 | 3,553 | 3,421
Other income (loss), net | (480) | (287) | (355) | (485)
EBITDA | (19,120) | (21,412) | (37,300) | (46,043)
Integration/acquisition costs |  | 2,615 | 181 | 2,615
Adjusted EBITDA | $ (19,120) | $ (18,797) | $ (37,119) | $ (43,428)

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