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Business Segments - Business Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2017 | Oct. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | $ 443,018 | $ 401,917 | $ 844,272 | $ 777,538
Deferred revenue adjustment due to acquisition |  |  |  | 3,535
Adjusted fee revenue |  |  |  | 781,073
Total revenue | 455,468 | 414,954 | 870,385 | 807,887
Net income attributable to Korn/Ferry International | 36,331 | 30,152 | 65,372 | 33,360
Net income attributable to noncontrolling interest | 401 | 904 | 789 | 1,764
Other (income) loss | (3,626) | 879 | (7,158) | (3,380)
Interest expense, net | 2,579 | 2,736 | 5,239 | 5,797
Equity in earnings of unconsolidated subsidiaries, net | (60) | (29) | (90) | (108)
Income tax provision | 15,619 | 11,906 | 27,829 | 13,631
Operating income (loss) | 51,244 | 46,548 | 91,981 | 51,064
Depreciation and amortization | 12,447 | 11,752 | 24,656 | 23,196
Other income (loss), net | 3,626 | (879) | 7,158 | 3,380
Equity in earnings of unconsolidated subsidiaries, net | 60 | 29 | 90 | 108
EBITDA | 67,377 | 57,450 | 123,885 | 77,748
Restructuring charges (recoveries), net | (202) |  | 78 | 24,520
Integration/acquisition costs | 2,393 | 5,820 | 4,981 | 13,847
Deferred revenue adjustment due to acquisition |  |  |  | 3,535
Adjusted EBITDA | 69,568 | 63,270 | 128,944 | 119,650
Operating Segments | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 176,766 | 156,228 | 337,957 | 302,589
Adjusted fee revenue |  |  |  | 302,589
Total revenue | 180,583 | 160,634 | 346,390 | 312,102
Operating income (loss) | 35,198 | 37,431 | 68,035 | 64,358
Depreciation and amortization | 1,925 | 1,657 | 3,729 | 3,037
Other income (loss), net | 466 | (124) | 929 | 348
Equity in earnings of unconsolidated subsidiaries, net | 60 | 29 | 90 | 108
EBITDA | 37,649 | 38,993 | 72,783 | 67,851
Restructuring charges (recoveries), net | 273 |  | 313 | 2,816
Adjusted EBITDA | 37,922 | 38,993 | 73,096 | 70,667
Operating Segments | Executive Search | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 101,544 | 92,732 | 193,377 | 174,534
Adjusted fee revenue |  |  |  | 174,534
Total revenue | 104,329 | 95,902 | 199,534 | 181,327
Operating income (loss) | 22,945 | 26,272 | 44,940 | 42,740
Depreciation and amortization | 984 | 990 | 1,933 | 1,820
Other income (loss), net | 290 | (92) | 572 | 196
Equity in earnings of unconsolidated subsidiaries, net | 60 | 29 | 90 | 108
EBITDA | 24,279 | 27,199 | 47,535 | 44,864
Restructuring charges (recoveries), net |  |  |  | 1,706
Adjusted EBITDA | 24,279 | 27,199 | 47,535 | 46,570
Operating Segments | Executive Search | EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 41,346 | 34,779 | 81,467 | 70,149
Adjusted fee revenue |  |  |  | 70,149
Total revenue | 42,073 | 35,507 | 83,131 | 71,756
Operating income (loss) | 6,345 | 6,847 | 13,020 | 12,874
Depreciation and amortization | 459 | 229 | 887 | 440
Other income (loss), net | 43 | (80) | 99 | (56)
EBITDA | 6,847 | 6,996 | 14,006 | 13,258
Restructuring charges (recoveries), net |  |  |  | 128
Adjusted EBITDA | 6,847 | 6,996 | 14,006 | 13,386
Operating Segments | Executive Search | Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 25,912 | 19,470 | 47,490 | 39,096
Adjusted fee revenue |  |  |  | 39,096
Total revenue | 26,187 | 19,929 | 48,067 | 40,109
Operating income (loss) | 4,381 | 2,028 | 7,522 | 4,130
Depreciation and amortization | 371 | 264 | 691 | 489
Other income (loss), net | 94 | 24 | 199 | 111
EBITDA | 4,846 | 2,316 | 8,412 | 4,730
Restructuring charges (recoveries), net | 273 |  | 313 | 622
Adjusted EBITDA | 5,119 | 2,316 | 8,725 | 5,352
Operating Segments | Executive Search | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 7,964 | 9,247 | 15,623 | 18,810
Adjusted fee revenue |  |  |  | 18,810
Total revenue | 7,994 | 9,296 | 15,658 | 18,910
Operating income (loss) | 1,527 | 2,284 | 2,553 | 4,614
Depreciation and amortization | 111 | 174 | 218 | 288
Other income (loss), net | 39 | 24 | 59 | 97
EBITDA | 1,677 | 2,482 | 2,830 | 4,999
Restructuring charges (recoveries), net |  |  |  | 360
Adjusted EBITDA | 1,677 | 2,482 | 2,830 | 5,359
Operating Segments | Hay Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 199,953 | 188,842 | 379,406 | 363,424
Deferred revenue adjustment due to acquisition |  |  |  | 3,535
Adjusted fee revenue |  |  |  | 366,959
Total revenue | 203,836 | 192,352 | 387,132 | 373,860
Operating income (loss) | 26,370 | 22,943 | 45,453 | 15,200
Depreciation and amortization | 8,143 | 8,025 | 16,228 | 16,041
Other income (loss), net | 57 | (11) | 89 | 224
EBITDA | 34,570 | 30,957 | 61,770 | 31,465
Restructuring charges (recoveries), net | (481) |  | (241) | 21,488
Integration/acquisition costs | 2,313 | 4,365 | 4,862 | 8,629
Deferred revenue adjustment due to acquisition |  |  |  | 3,535
Adjusted EBITDA | 36,402 | 35,322 | 66,391 | 65,117
Operating Segments | Futurestep |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 66,299 | 56,847 | 126,909 | 111,525
Adjusted fee revenue |  |  |  | 111,525
Total revenue | 71,049 | 61,968 | 136,863 | 121,925
Operating income (loss) | 9,409 | 7,787 | 17,646 | 15,300
Depreciation and amortization | 784 | 669 | 1,580 | 1,292
Other income (loss), net |  |  | 8 | (2)
EBITDA | 10,193 | 8,456 | 19,234 | 16,590
Restructuring charges (recoveries), net | 6 |  | 6 |
Adjusted EBITDA | 10,199 | 8,456 | 19,240 | 16,590
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (19,733) | (21,613) | (39,153) | (43,794)
Depreciation and amortization | 1,595 | 1,401 | 3,119 | 2,826
Other income (loss), net | 3,103 | (744) | 6,132 | 2,810
EBITDA | (15,035) | (20,956) | (29,902) | (38,158)
Restructuring charges (recoveries), net |  |  |  | 216
Integration/acquisition costs | 80 | 1,455 | 119 | 5,218
Adjusted EBITDA | $ (14,955) | $ (19,501) | $ (29,783) | $ (32,724)

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