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Business Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2017 | Jan. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | $ 381,918 | $ 344,158 | $ 1,159,456 | $ 892,152
Deferred revenue adjustment due to acquisition |  | 5,871 | 3,535 | 5,871
Adjusted fee revenue |  | 350,029 | 1,162,991 | 898,023
Total revenue | 394,195 | 358,879 | 1,202,082 | 929,553
Net income (loss) attributable to Korn/Ferry International | 23,897 | (15,995) | 57,257 | 25,058
Net income attributable to noncontrolling interest | 481 |  | 2,245 |
Other (income) loss, net | (4,200) | 7,092 | (7,580) | 9,812
Interest expense, net | 2,402 | 372 | 8,199 | 1,215
Equity in earnings of unconsolidated subsidiaries, net | (113) | (181) | (221) | (1,446)
Income tax provision (benefit) | 8,075 | (5,355) | 21,706 | 13,211
Operating income (loss) | 30,542 | (14,067) | 81,606 | 47,850
Depreciation and amortization | 11,774 | 10,330 | 34,970 | 24,933
Other income (loss), net | 4,200 | (7,092) | 7,580 | (9,812)
Equity in earnings of unconsolidated subsidiaries, net | 113 | 181 | 221 | 1,446
EBITDA | 46,629 | (10,648) | 124,377 | 64,417
Restructuring charges, net | 3,801 | 30,577 | 28,321 | 30,577
Integration/acquisition cost | 4,830 | 21,147 | 18,677 | 33,815
Deferred revenue adjustment due to acquisition |  | 5,871 | 3,535 | 5,871
Separation costs |  | 744 |  | 744
Adjusted EBITDA | 55,260 | 47,691 | 174,910 | 135,424
Operating Segments | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 152,821 | 154,653 | 455,410 | 463,215
Adjusted fee revenue |  | 154,653 | 455,410 | 463,215
Total revenue | 157,132 | 159,662 | 469,234 | 479,096
Operating income (loss) | 29,331 | 34,605 | 93,689 | 108,748
Depreciation and amortization | 1,469 | 1,333 | 4,506 | 4,209
Other income (loss), net | 456 | (358) | 804 | (19)
Equity in earnings of unconsolidated subsidiaries, net | 113 | 26 | 221 | 252
EBITDA | 31,369 | 35,606 | 99,220 | 113,190
Restructuring charges, net | 1,202 | 7,255 | 4,018 | 7,255
Adjusted EBITDA | 32,571 | 42,861 | 103,238 | 120,445
Operating Segments | Executive Search | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 84,827 | 93,520 | 259,361 | 276,667
Adjusted fee revenue |  | 93,520 | 259,361 | 276,667
Total revenue | 87,975 | 97,097 | 269,302 | 287,694
Operating income (loss) | 17,718 | 28,957 | 60,458 | 80,524
Depreciation and amortization | 996 | 812 | 2,816 | 2,471
Other income (loss), net | 316 | (330) | 512 | (425)
Equity in earnings of unconsolidated subsidiaries, net | 113 | 26 | 221 | 252
EBITDA | 19,143 | 29,465 | 64,007 | 82,822
Restructuring charges, net |  | 484 | 1,706 | 484
Adjusted EBITDA | 19,143 | 29,949 | 65,713 | 83,306
Operating Segments | Executive Search | EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 39,147 | 35,498 | 109,296 | 108,158
Adjusted fee revenue |  | 35,498 | 109,296 | 108,158
Total revenue | 39,965 | 36,417 | 111,721 | 111,097
Operating income (loss) | 8,175 | 1,707 | 21,049 | 14,912
Depreciation and amortization | 226 | 213 | 666 | 810
Other income (loss), net | 19 | 77 | (37) | 227
EBITDA | 8,420 | 1,997 | 21,678 | 15,949
Restructuring charges, net |  | 5,866 | 128 | 5,866
Adjusted EBITDA | 8,420 | 7,863 | 21,806 | 21,815
Operating Segments | Executive Search | Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 21,012 | 19,094 | 60,108 | 59,307
Adjusted fee revenue |  | 19,094 | 60,108 | 59,307
Total revenue | 21,336 | 19,603 | 61,445 | 61,210
Operating income (loss) | 2,086 | 2,775 | 6,216 | 9,668
Depreciation and amortization | 268 | 235 | 757 | 704
Other income (loss), net | 60 | (114) | 171 | (102)
EBITDA | 2,414 | 2,896 | 7,144 | 10,270
Restructuring charges, net | 893 | 577 | 1,515 | 577
Adjusted EBITDA | 3,307 | 3,473 | 8,659 | 10,847
Operating Segments | Executive Search | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 7,835 | 6,541 | 26,645 | 19,083
Adjusted fee revenue |  | 6,541 | 26,645 | 19,083
Total revenue | 7,856 | 6,545 | 26,766 | 19,095
Operating income (loss) | 1,352 | 1,166 | 5,966 | 3,644
Depreciation and amortization | (21) | 73 | 267 | 224
Other income (loss), net | 61 | 9 | 158 | 281
EBITDA | 1,392 | 1,248 | 6,391 | 4,149
Restructuring charges, net | 309 | 328 | 669 | 328
Adjusted EBITDA | 1,701 | 1,576 | 7,060 | 4,477
Operating Segments | Hay Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 175,662 | 140,508 | 539,086 | 283,350
Deferred revenue adjustment due to acquisition |  | 5,871 | 3,535 | 5,871
Adjusted fee revenue |  | 146,379 | 542,621 | 289,221
Total revenue | 178,962 | 146,079 | 552,822 | 293,511
Operating income (loss) | 15,988 | (21,559) | 31,188 | (6,286)
Depreciation and amortization | 8,061 | 6,722 | 24,102 | 14,058
Other income (loss), net | 122 | 143 | 346 | (737)
EBITDA | 24,171 | (14,694) | 55,636 | 7,035
Restructuring charges, net | 2,519 | 23,241 | 24,007 | 23,241
Integration/acquisition cost | 3,364 | 8,413 | 11,993 | 12,052
Deferred revenue adjustment due to acquisition |  | 5,871 | 3,535 | 5,871
Adjusted EBITDA | 30,054 | 22,831 | 95,171 | 48,199
Operating Segments | Futurestep |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Fee revenue | 53,435 | 48,997 | 164,960 | 145,587
Adjusted fee revenue |  | 48,997 | 164,960 | 145,587
Total revenue | 58,101 | 53,138 | 180,026 | 156,946
Operating income (loss) | 6,549 | 6,630 | 21,849 | 19,715
Depreciation and amortization | 789 | 609 | 2,081 | 1,772
Other income (loss), net | (2) | 79 | (4) | 87
EBITDA | 7,336 | 7,318 | 23,926 | 21,574
Restructuring charges, net | 80 |  | 80 |
Adjusted EBITDA | 7,416 | 7,318 | 24,006 | 21,574
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (21,326) | (33,743) | (65,120) | (74,327)
Depreciation and amortization | 1,455 | 1,666 | 4,281 | 4,894
Other income (loss), net | 3,624 | (6,956) | 6,434 | (9,143)
Equity in earnings of unconsolidated subsidiaries, net |  | 155 |  | 1,194
EBITDA | (16,247) | (38,878) | (54,405) | (77,382)
Restructuring charges, net |  | 81 | 216 | 81
Integration/acquisition cost | 1,466 | 12,734 | 6,684 | 21,763
Separation costs |  | 744 |  | 744
Adjusted EBITDA | $ (14,781) | $ (25,319) | $ (47,505) | $ (54,794)

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