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Business Segments - Financial Highlights by Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2019 | Jan. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 486,172 | $ 460,770 | $ 1,471,327 | $ 1,331,155
Net income attributable to Korn Ferry | 44,964 | 27,247 | 52,387 | 92,619
Net income attributable to noncontrolling interest | 480 | 180 | 1,782 | 969
Other loss (income), net | (2,401) | (7,510) | (2,292) | (14,311)
Interest expense, net | 4,282 | 3,710 | 12,722 | 11,014
Equity in earnings of unconsolidated subsidiaries, net | (62) | (97) | (191) | (187)
Income tax (benefit) provision | 15,420 | 26,316 | 14,143 | 54,145
Operating income (loss) | 62,683 | 49,846 | 78,551 | 144,249
Depreciation and amortization | 11,741 | 12,225 | 34,490 | 36,881
Other income (loss), net | 2,401 | 7,510 | 2,292 | 14,311
Equity in earnings of unconsolidated subsidiaries | 62 | 97 | 191 | 187
EBITDA | 76,887 | 69,678 | 115,524 | 195,628
Restructuring (recoveries) charges, net |  |  |  | 78
Integration/acquisition costs | 804 | 1,673 | 6,746 | 6,654
Tradename write-offs |  |  | 106,555 |
Adjusted EBITDA | 77,691 | 71,351 | 228,825 | 202,360
Fee Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 474,504 | 447,581 | 1,435,277 | 1,291,853
Operating Segments | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 197,983 | 185,493 | 598,033 | 531,883
Operating income (loss) | 44,703 | 34,434 | 137,048 | 102,638
Depreciation and amortization | 1,807 | 1,922 | 5,172 | 5,651
Other income (loss), net | 1,589 | 847 | 1,724 | 1,776
Equity in earnings of unconsolidated subsidiaries | 62 | 97 | 191 | 187
EBITDA | 48,161 | 37,300 | 144,135 | 110,252
Restructuring (recoveries) charges, net |  |  |  | 313
Adjusted EBITDA | 48,161 | 37,300 | 144,135 | 110,565
Operating Segments | Executive Search | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 117,725 | 106,332 | 352,804 | 305,866
Operating income (loss) | 30,596 | 21,408 | 92,438 | 66,517
Depreciation and amortization | 970 | 990 | 2,917 | 2,923
Other income (loss), net | 1,564 | 585 | 955 | 1,157
Equity in earnings of unconsolidated subsidiaries | 62 | 97 | 191 | 187
EBITDA | 33,192 | 23,080 | 96,501 | 70,784
Adjusted EBITDA | 33,192 | 23,080 | 96,501 | 70,784
Operating Segments | Executive Search | EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 46,639 | 47,763 | 140,024 | 130,894
Operating income (loss) | 7,525 | 7,329 | 21,813 | 20,349
Depreciation and amortization | 402 | 458 | 867 | 1,345
Other income (loss), net | 26 | 37 | 388 | 136
EBITDA | 7,953 | 7,824 | 23,068 | 21,830
Adjusted EBITDA | 7,953 | 7,824 | 23,068 | 21,830
Operating Segments | Executive Search | Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 26,046 | 24,942 | 80,817 | 73,009
Operating income (loss) | 5,929 | 5,289 | 19,337 | 12,811
Depreciation and amortization | 338 | 361 | 1,083 | 1,052
Other income (loss), net | (134) | 185 | 118 | 384
EBITDA | 6,133 | 5,835 | 20,538 | 14,247
Restructuring (recoveries) charges, net |  |  |  | 313
Adjusted EBITDA | 6,133 | 5,835 | 20,538 | 14,560
Operating Segments | Executive Search | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 7,573 | 6,456 | 24,388 | 22,114
Operating income (loss) | 653 | 408 | 3,460 | 2,961
Depreciation and amortization | 97 | 113 | 305 | 331
Other income (loss), net | 133 | 40 | 263 | 99
EBITDA | 883 | 561 | 4,028 | 3,391
Adjusted EBITDA | 883 | 561 | 4,028 | 3,391
Operating Segments | Advisory |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 205,677 | 201,961 | 627,243 | 589,093
Operating income (loss) | 29,279 | 27,057 | (24,374) | 72,459
Depreciation and amortization | 7,307 | 7,882 | 21,702 | 24,110
Other income (loss), net | 786 | 768 | 1,621 | 1,654
EBITDA | 37,372 | 35,707 | (1,051) | 98,223
Restructuring (recoveries) charges, net |  |  |  | (241)
Integration/acquisition costs | 777 | 1,593 | 6,559 | 6,455
Tradename write-offs |  |  | 106,555 |
Adjusted EBITDA | 38,149 | 37,300 | 112,063 | 104,437
Operating Segments | RPO & Professional Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 82,512 | 73,316 | 246,051 | 210,179
Operating income (loss) | 12,176 | 10,064 | 36,337 | 27,727
Depreciation and amortization | 803 | 733 | 2,325 | 2,313
Other income (loss), net | 77 | 2 | 103 | 10
EBITDA | 13,056 | 10,799 | 38,765 | 30,050
Restructuring (recoveries) charges, net |  |  |  | 6
Adjusted EBITDA | 13,056 | 10,799 | 38,765 | 30,056
Operating Segments | Fee Revenue | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 193,396 | 180,416 | 583,954 | 518,373
Operating Segments | Fee Revenue | Executive Search | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 114,215 | 102,716 | 342,175 | 296,093
Operating Segments | Fee Revenue | Executive Search | EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 45,940 | 46,782 | 137,522 | 128,249
Operating Segments | Fee Revenue | Executive Search | Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 25,687 | 24,493 | 79,918 | 71,983
Operating Segments | Fee Revenue | Executive Search | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 7,554 | 6,425 | 24,339 | 22,048
Operating Segments | Fee Revenue | Advisory |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 201,502 | 198,056 | 613,966 | 577,462
Operating Segments | Fee Revenue | RPO & Professional Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 79,606 | 69,109 | 237,357 | 196,018
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (23,475) | (21,709) | (70,460) | (58,575)
Depreciation and amortization | 1,824 | 1,688 | 5,291 | 4,807
Other income (loss), net | (51) | 5,893 | (1,156) | 10,871
EBITDA | (21,702) | (14,128) | (66,325) | (42,897)
Integration/acquisition costs | 27 | 80 | 187 | 199
Adjusted EBITDA | $ (21,675) | $ (14,048) | $ (66,138) | $ (42,698)

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