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Business Segments - Financial Highlights by Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2018 | Jul. 31, 2017
Segment Reporting Information [Line Items] |  |
Total revenue | $ 478,362 | $ 414,917
Net (loss) income attributable to Korn/Ferry International | (38,611) | 29,041
Net income attributable to noncontrolling interest | 19 | 388
Other income, net | (4,491) | (3,354)
Interest expense, net | 4,103 | 3,680
Equity in earnings of unconsolidated subsidiaries, net | (29) | (30)
Income tax (benefit) provision | (16,110) | 12,210
Operating (loss) income | (55,119) | 41,935
Depreciation and amortization | 11,731 | 12,209
Other income (loss), net | 4,491 | 3,354
Equity in earnings of unconsolidated subsidiaries, net | 29 | 30
EBITDA | (38,868) | 57,528
Restructuring charges, net |  | 280
Integration/acquisition costs | 3,107 | 2,588
Tradename write-offs | 106,555 |
Adjusted EBITDA | 70,794 | 60,396
Fee Revenue |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 465,568 | 401,254
Operating Segments | Executive Search |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 198,034 | 165,807
Operating (loss) income | 40,878 | 32,912
Depreciation and amortization | 1,826 | 1,804
Other income (loss), net | 4,024 | 463
Equity in earnings of unconsolidated subsidiaries, net | 29 | 30
EBITDA | 46,757 | 35,209
Restructuring charges, net |  | 40
Adjusted EBITDA | 46,757 | 35,249
Operating Segments | Executive Search | North America |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 115,757 | 95,205
Operating (loss) income | 26,514 | 22,070
Depreciation and amortization | 979 | 949
Other income (loss), net | 3,472 | 282
Equity in earnings of unconsolidated subsidiaries, net | 29 | 30
EBITDA | 30,994 | 23,331
Adjusted EBITDA | 30,994 | 23,331
Operating Segments | Executive Search | EMEA |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 47,749 | 41,058
Operating (loss) income | 6,969 | 6,675
Depreciation and amortization | 370 | 428
Other income (loss), net | 340 | 56
EBITDA | 7,679 | 7,159
Adjusted EBITDA | 7,679 | 7,159
Operating Segments | Executive Search | Asia Pacific |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 26,625 | 21,880
Operating (loss) income | 6,641 | 3,141
Depreciation and amortization | 370 | 320
Other income (loss), net | 175 | 105
EBITDA | 7,186 | 3,566
Restructuring charges, net |  | 40
Adjusted EBITDA | 7,186 | 3,606
Operating Segments | Executive Search | Latin America |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 7,903 | 7,664
Operating (loss) income | 754 | 1,026
Depreciation and amortization | 107 | 107
Other income (loss), net | 37 | 20
EBITDA | 898 | 1,153
Adjusted EBITDA | 898 | 1,153
Operating Segments | Advisory |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 200,147 | 183,296
Operating (loss) income | (83,079) | 19,055
Depreciation and amortization | 7,431 | 8,085
Other income (loss), net | 570 | 431
EBITDA | (75,078) | 27,571
Restructuring charges, net |  | 240
Integration/acquisition costs | 3,027 | 2,549
Tradename write-offs | 106,555 |
Adjusted EBITDA | 34,504 | 30,360
Operating Segments | RPO & Professional Search |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 80,181 | 65,814
Operating (loss) income | 11,645 | 8,245
Depreciation and amortization | 761 | 796
Other income (loss), net | 105 | 8
EBITDA | 12,511 | 9,049
Adjusted EBITDA | 12,511 | 9,049
Operating Segments | Fee Revenue | Executive Search |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 192,924 | 161,191
Operating Segments | Fee Revenue | Executive Search | North America |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 112,097 | 91,833
Operating Segments | Fee Revenue | Executive Search | EMEA |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 46,654 | 40,121
Operating Segments | Fee Revenue | Executive Search | Asia Pacific |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 26,295 | 21,578
Operating Segments | Fee Revenue | Executive Search | Latin America |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 7,878 | 7,659
Operating Segments | Fee Revenue | Advisory |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 195,375 | 179,453
Operating Segments | Fee Revenue | RPO & Professional Search |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 77,269 | 60,610
Corporate |  |
Segment Reporting Information [Line Items] |  |
Operating (loss) income | (24,563) | (18,277)
Depreciation and amortization | 1,713 | 1,524
Other income (loss), net | (208) | 2,452
EBITDA | (23,058) | (14,301)
Integration/acquisition costs | 80 | 39
Adjusted EBITDA | $ (22,978) | $ (14,262)

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