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Business Segments - Financial Highlights by Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 506,793 | $ 455,468 | $ 985,155 | $ 870,385
Net income attributable to Korn/Ferry International | 46,034 | 36,331 | 7,423 | 65,372
Net income attributable to noncontrolling interest | 1,283 | 401 | 1,302 | 789
Other loss (income), net | 4,600 | (3,447) | 109 | (6,801)
Interest expense, net | 4,337 | 3,624 | 8,440 | 7,304
Equity in earnings of unconsolidated subsidiaries, net | (100) | (60) | (129) | (90)
Income tax provision (benefit) | 14,833 | 15,619 | (1,277) | 27,829
Operating income (loss) | 70,987 | 52,468 | 15,868 | 94,403
Depreciation and amortization | 11,018 | 12,447 | 22,749 | 24,656
Other (loss) income, net | (4,600) | 3,447 | (109) | 6,801
Equity in earnings of unconsolidated subsidiaries | 100 | 60 | 129 | 90
EBITDA | 77,505 | 68,422 | 38,637 | 125,950
Restructuring (recoveries) charges, net |  | (202) |  | 78
Integration/acquisition costs | 2,835 | 2,393 | 5,942 | 4,981
Tradename write-offs |  |  | 106,555 |
Adjusted EBITDA | 80,340 | 70,613 | 151,134 | 131,009
Fee Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 495,205 | 443,018 | 960,773 | 844,272
Operating Segments | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 202,016 | 180,583 | 400,050 | 346,390
Operating income (loss) | 51,467 | 35,292 | 92,345 | 68,204
Depreciation and amortization | 1,539 | 1,925 | 3,365 | 3,729
Other (loss) income, net | (3,889) | 466 | 135 | 929
Equity in earnings of unconsolidated subsidiaries | 100 | 60 | 129 | 90
EBITDA | 49,217 | 37,743 | 95,974 | 72,952
Restructuring (recoveries) charges, net |  | 273 |  | 313
Adjusted EBITDA | 49,217 | 38,016 | 95,974 | 73,265
Operating Segments | Executive Search | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 119,322 | 104,329 | 235,079 | 199,534
Operating income (loss) | 35,328 | 23,039 | 61,842 | 45,109
Depreciation and amortization | 968 | 984 | 1,947 | 1,933
Other (loss) income, net | (4,081) | 290 | (609) | 572
Equity in earnings of unconsolidated subsidiaries | 100 | 60 | 129 | 90
EBITDA | 32,315 | 24,373 | 63,309 | 47,704
Adjusted EBITDA | 32,315 | 24,373 | 63,309 | 47,704
Operating Segments | Executive Search | EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 45,636 | 42,073 | 93,385 | 83,131
Operating income (loss) | 7,319 | 6,345 | 14,288 | 13,020
Depreciation and amortization | 95 | 459 | 465 | 887
Other (loss) income, net | 22 | 43 | 362 | 99
EBITDA | 7,436 | 6,847 | 15,115 | 14,006
Adjusted EBITDA | 7,436 | 6,847 | 15,115 | 14,006
Operating Segments | Executive Search | Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 28,146 | 26,187 | 54,771 | 48,067
Operating income (loss) | 6,767 | 4,381 | 13,408 | 7,522
Depreciation and amortization | 375 | 371 | 745 | 691
Other (loss) income, net | 77 | 94 | 252 | 199
EBITDA | 7,219 | 4,846 | 14,405 | 8,412
Restructuring (recoveries) charges, net |  | 273 |  | 313
Adjusted EBITDA | 7,219 | 5,119 | 14,405 | 8,725
Operating Segments | Executive Search | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 8,912 | 7,994 | 16,815 | 15,658
Operating income (loss) | 2,053 | 1,527 | 2,807 | 2,553
Depreciation and amortization | 101 | 111 | 208 | 218
Other (loss) income, net | 93 | 39 | 130 | 59
EBITDA | 2,247 | 1,677 | 3,145 | 2,830
Adjusted EBITDA | 2,247 | 1,677 | 3,145 | 2,830
Operating Segments | Advisory |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 221,419 | 203,836 | 421,566 | 387,132
Operating income (loss) | 29,426 | 26,347 | (53,653) | 45,402
Depreciation and amortization | 6,964 | 8,143 | 14,395 | 16,228
Other (loss) income, net | 265 | 455 | 835 | 886
EBITDA | 36,655 | 34,945 | (38,423) | 62,516
Restructuring (recoveries) charges, net |  | (481) |  | (241)
Integration/acquisition costs | 2,755 | 2,313 | 5,782 | 4,862
Tradename write-offs |  |  | 106,555 |
Adjusted EBITDA | 39,410 | 36,777 | 73,914 | 67,137
Operating Segments | RPO & Professional Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 83,358 | 71,049 | 163,539 | 136,863
Operating income (loss) | 12,516 | 9,418 | 24,161 | 17,663
Depreciation and amortization | 761 | 784 | 1,522 | 1,580
Other (loss) income, net | (79) |  | 26 | 8
EBITDA | 13,198 | 10,202 | 25,709 | 19,251
Restructuring (recoveries) charges, net |  | 6 |  | 6
Adjusted EBITDA | 13,198 | 10,208 | 25,709 | 19,257
Operating Segments | Fee Revenue | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 197,634 | 176,766 | 390,558 | 337,957
Operating Segments | Fee Revenue | Executive Search | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 115,863 | 101,544 | 227,960 | 193,377
Operating Segments | Fee Revenue | Executive Search | EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 44,928 | 41,346 | 91,582 | 81,467
Operating Segments | Fee Revenue | Executive Search | Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 27,936 | 25,912 | 54,231 | 47,490
Operating Segments | Fee Revenue | Executive Search | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 8,907 | 7,964 | 16,785 | 15,623
Operating Segments | Fee Revenue | Advisory |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 217,089 | 199,953 | 412,464 | 379,406
Operating Segments | Fee Revenue | RPO & Professional Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 80,482 | 66,299 | 157,751 | 126,909
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (22,422) | (18,589) | (46,985) | (36,866)
Depreciation and amortization | 1,754 | 1,595 | 3,467 | 3,119
Other (loss) income, net | (897) | 2,526 | (1,105) | 4,978
EBITDA | (21,565) | (14,468) | (44,623) | (28,769)
Integration/acquisition costs | 80 | 80 | 160 | 119
Adjusted EBITDA | $ (21,485) | $ (14,388) | $ (44,463) | $ (28,650)

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