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Business Segments - Business Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | $ 447,581 | $ 381,918 | $ 1,291,853 | $ 1,159,456
Deferred revenue adjustment due to acquisition |  |  |  | 3,535
Adjusted fee revenue |  |  |  | 1,162,991
Total revenue | 460,770 | 394,195 | 1,331,155 | 1,202,082
Net income attributable to Korn/Ferry International | 27,247 | 23,897 | 92,619 | 57,257
Net income attributable to noncontrolling interest | 180 | 481 | 969 | 2,245
Other income, net | (7,689) | (4,200) | (14,847) | (7,580)
Interest expense, net | 2,665 | 2,402 | 7,904 | 8,199
Equity in earnings of unconsolidated subsidiaries, net | (97) | (113) | (187) | (221)
Income tax provision | 26,316 | 8,075 | 54,145 | 21,706
Operating income (loss) | 48,622 | 30,542 | 140,603 | 81,606
Depreciation and amortization | 12,225 | 11,774 | 36,881 | 34,970
Other income (loss), net | 7,689 | 4,200 | 14,847 | 7,580
Equity in earnings of unconsolidated subsidiaries, net | 97 | 113 | 187 | 221
EBITDA | 68,633 | 46,629 | 192,518 | 124,377
Restructuring charges (recoveries), net |  | 3,801 | 78 | 28,321
Integration/acquisition costs | 1,673 | 4,830 | 6,654 | 18,677
Deferred revenue adjustment due to acquisition |  |  |  | 3,535
Adjusted EBITDA | 70,306 | 55,260 | 199,250 | 174,910
Operating Segments | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 180,416 | 152,821 | 518,373 | 455,410
Adjusted fee revenue |  |  |  | 455,410
Total revenue | 185,493 | 157,132 | 531,883 | 469,234
Operating income (loss) | 34,339 | 29,331 | 102,374 | 93,689
Depreciation and amortization | 1,922 | 1,469 | 5,651 | 4,506
Other income (loss), net | 847 | 456 | 1,776 | 804
Equity in earnings of unconsolidated subsidiaries, net | 97 | 113 | 187 | 221
EBITDA | 37,205 | 31,369 | 109,988 | 99,220
Restructuring charges (recoveries), net |  | 1,202 | 313 | 4,018
Adjusted EBITDA | 37,205 | 32,571 | 110,301 | 103,238
Operating Segments | Executive Search | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 102,716 | 84,827 | 296,093 | 259,361
Adjusted fee revenue |  |  |  | 259,361
Total revenue | 106,332 | 87,975 | 305,866 | 269,302
Operating income (loss) | 21,313 | 17,718 | 66,253 | 60,458
Depreciation and amortization | 990 | 996 | 2,923 | 2,816
Other income (loss), net | 585 | 316 | 1,157 | 512
Equity in earnings of unconsolidated subsidiaries, net | 97 | 113 | 187 | 221
EBITDA | 22,985 | 19,143 | 70,520 | 64,007
Restructuring charges (recoveries), net |  |  |  | 1,706
Adjusted EBITDA | 22,985 | 19,143 | 70,520 | 65,713
Operating Segments | Executive Search | EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 46,782 | 39,147 | 128,249 | 109,296
Adjusted fee revenue |  |  |  | 109,296
Total revenue | 47,763 | 39,965 | 130,894 | 111,721
Operating income (loss) | 7,329 | 8,175 | 20,349 | 21,049
Depreciation and amortization | 458 | 226 | 1,345 | 666
Other income (loss), net | 37 | 19 | 136 | (37)
EBITDA | 7,824 | 8,420 | 21,830 | 21,678
Restructuring charges (recoveries), net |  |  |  | 128
Adjusted EBITDA | 7,824 | 8,420 | 21,830 | 21,806
Operating Segments | Executive Search | Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 24,493 | 21,012 | 71,983 | 60,108
Adjusted fee revenue |  |  |  | 60,108
Total revenue | 24,942 | 21,336 | 73,009 | 61,445
Operating income (loss) | 5,289 | 2,086 | 12,811 | 6,216
Depreciation and amortization | 361 | 268 | 1,052 | 757
Other income (loss), net | 185 | 60 | 384 | 171
EBITDA | 5,835 | 2,414 | 14,247 | 7,144
Restructuring charges (recoveries), net |  | 893 | 313 | 1,515
Adjusted EBITDA | 5,835 | 3,307 | 14,560 | 8,659
Operating Segments | Executive Search | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 6,425 | 7,835 | 22,048 | 26,645
Adjusted fee revenue |  |  |  | 26,645
Total revenue | 6,456 | 7,856 | 22,114 | 26,766
Operating income (loss) | 408 | 1,352 | 2,961 | 5,966
Depreciation and amortization | 113 | (21) | 331 | 267
Other income (loss), net | 40 | 61 | 99 | 158
EBITDA | 561 | 1,392 | 3,391 | 6,391
Restructuring charges (recoveries), net |  | 309 |  | 669
Adjusted EBITDA | 561 | 1,701 | 3,391 | 7,060
Operating Segments | Hay Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 198,056 | 175,662 | 577,462 | 539,086
Deferred revenue adjustment due to acquisition |  |  |  | 3,535
Adjusted fee revenue |  |  |  | 542,621
Total revenue | 201,961 | 178,962 | 589,093 | 552,822
Operating income (loss) | 27,079 | 15,988 | 72,532 | 31,188
Depreciation and amortization | 7,882 | 8,061 | 24,110 | 24,102
Other income (loss), net | 370 | 122 | 459 | 346
EBITDA | 35,331 | 24,171 | 97,101 | 55,636
Restructuring charges (recoveries), net |  | 2,519 | (241) | 24,007
Integration/acquisition costs | 1,593 | 3,364 | 6,455 | 11,993
Deferred revenue adjustment due to acquisition |  |  |  | 3,535
Adjusted EBITDA | 36,924 | 30,054 | 103,315 | 95,171
Operating Segments | Futurestep |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 69,109 | 53,435 | 196,018 | 164,960
Adjusted fee revenue |  |  |  | 164,960
Total revenue | 73,316 | 58,101 | 210,179 | 180,026
Operating income (loss) | 10,056 | 6,549 | 27,702 | 21,849
Depreciation and amortization | 733 | 789 | 2,313 | 2,081
Other income (loss), net | 2 | (2) | 10 | (4)
EBITDA | 10,791 | 7,336 | 30,025 | 23,926
Restructuring charges (recoveries), net |  | 80 | 6 | 80
Adjusted EBITDA | 10,791 | 7,416 | 30,031 | 24,006
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (22,852) | (21,326) | (62,005) | (65,120)
Depreciation and amortization | 1,688 | 1,455 | 4,807 | 4,281
Other income (loss), net | 6,470 | 3,624 | 12,602 | 6,434
EBITDA | (14,694) | (16,247) | (44,596) | (54,405)
Restructuring charges (recoveries), net |  |  |  | 216
Integration/acquisition costs | 80 | 1,466 | 199 | 6,684
Adjusted EBITDA | $ (14,614) | $ (14,781) | $ (44,397) | $ (47,505)

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