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Quarterly Results (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee revenue | $ 406,065 | $ 381,918 | $ 401,917 | $ 375,621 | $ 399,960 | $ 344,158 | $ 280,600 | $ 267,394 | $ 1,565,521 | $ 1,292,112 | $ 1,028,152
Operating income (loss) | 32,834 | 30,542 | 46,548 | 4,516 | 4,842 | (14,067) | 29,013 | 32,904 | 114,440 | 52,692 | 114,028
Net income (loss) | 27,736 | 24,378 | 31,056 | 4,068 | 6,375 | (15,995) | 17,971 | 23,082 | 87,238 | 31,433 | 88,357
Net income (loss) attributable to Korn/Ferry International | $ 26,924 | $ 23,897 | $ 30,152 | $ 3,208 | $ 5,855 | $ (15,995) | $ 17,971 | $ 23,082 | $ 84,181 | $ 30,913 | $ 88,357
Basic | $ 0.48 | $ 0.42 | $ 0.53 | $ 0.06 | $ 0.10 | $ (0.30) | $ 0.36 | $ 0.46 | $ 1.48 | $ 0.58 | $ 1.78
Diluted | $ 0.47 | $ 0.42 | $ 0.52 | $ 0.06 | $ 0.10 | $ (0.30) | $ 0.35 | $ 0.46 | $ 1.47 | $ 0.58 | $ 1.76

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