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Business Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  | $ 271,717 | $ 249,545 | $ 255,702 | $ 251,188 | $ 251,712 | $ 242,184 | $ 237,968 | $ 228,437 | $ 1,028,152 | $ 960,301 | $ 812,831
Total revenue |  |  |  |  |  |  |  |  |  | 1,066,066 | 995,559 | 849,701
Net income |  | 25,482 | 22,939 | 25,403 | 14,533 | 21,211 | 21,304 | 18,759 | 11,417 | 88,357 | 72,691 | 33,293
Other income, net |  |  |  |  |  |  |  |  |  | (7,458) | (9,769) | (6,309)
Interest (income) expense, net |  |  |  |  |  |  |  |  |  | 1,784 | 2,363 | 2,365
Equity in earnings of unconsolidated subsidiaries, net |  |  |  |  |  |  |  |  |  | (2,181) | (2,169) | (2,110)
Income tax provision |  |  |  |  |  |  |  |  |  | 33,526 | 28,492 | 16,637
Operating income |  | 28,092 | $ 32,927 | $ 34,416 | $ 18,593 | 24,480 | $ 27,302 | $ 23,165 | $ 16,661 | 114,028 | 91,608 | 43,876
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 27,597 | 26,172 | 19,004
Other income (loss), net |  |  |  |  |  |  |  |  |  | 7,458 | 9,769 | 6,309
Equity in earnings of unconsolidated subsidiaries, net |  |  |  |  |  |  |  |  |  | 2,181 | 2,169 | 2,110
EBITDA |  |  |  |  |  |  |  |  |  | 151,264 | 129,718 | 71,299
Restructuring charges, net |  |  |  |  |  |  |  |  |  | 9,468 | 3,682 | 22,857
Integration/acquisition costs |  |  |  |  |  |  |  |  |  |  |  | 3,106
Acquisition costs |  |  |  |  |  |  |  |  |  | 959 |  |
Separation costs |  |  |  |  |  |  |  |  |  |  | 4,500 | 516
Integration costs |  |  |  |  |  |  |  |  |  |  | 394 |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 161,691 | 138,294 | 97,778
Identifiable assets | [1] | 1,317,801 |  |  |  | 1,233,666 |  |  |  | 1,317,801 | 1,233,666 | 1,115,229
Long-lived assets | [1] | 62,088 |  |  |  | 60,434 |  |  |  | 62,088 | 60,434 | 53,628
Goodwill | [1] | 254,440 |  |  |  | 257,582 |  |  |  | 254,440 | 257,582 | 257,293
Operating Segments | Executive Recruitment |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  | 597,407 | 568,875 | 522,479
Total revenue |  |  |  |  |  |  |  |  |  | 619,325 | 591,190 | 544,831
Operating income |  |  |  |  |  |  |  |  |  | 119,020 | 116,352 | 80,965
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 6,674 | 8,012 | 8,991
Other income (loss), net |  |  |  |  |  |  |  |  |  | 849 | 1,769 | 793
Equity in earnings of unconsolidated subsidiaries, net |  |  |  |  |  |  |  |  |  | 426 | 383 | 434
EBITDA |  |  |  |  |  |  |  |  |  | 126,969 | 126,516 | 91,183
Restructuring charges, net |  |  |  |  |  |  |  |  |  | 5,384 | 1,336 | 8,194
Separation costs |  |  |  |  |  |  |  |  |  |  |  | 516
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 132,353 | 127,852 | 99,893
Identifiable assets | [1] | 602,945 |  |  |  | 562,354 |  |  |  | 602,945 | 562,354 | 453,489
Long-lived assets | [1] | 26,357 |  |  |  | 28,308 |  |  |  | 26,357 | 28,308 | 29,157
Goodwill | [1] | 96,497 |  |  |  | 104,615 |  |  |  | 96,497 | 104,615 | 105,749
Operating Segments | Executive Recruitment | North America |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  | 330,634 | 306,768 | 290,317
Total revenue |  |  |  |  |  |  |  |  |  | 344,913 | 321,473 | 305,993
Operating income |  |  |  |  |  |  |  |  |  | 80,818 | 70,256 | 58,832
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 3,515 | 3,579 | 4,726
Other income (loss), net |  |  |  |  |  |  |  |  |  | 288 | 631 | 466
Equity in earnings of unconsolidated subsidiaries, net |  |  |  |  |  |  |  |  |  | 426 | 383 | 434
EBITDA |  |  |  |  |  |  |  |  |  | 85,047 | 74,849 | 64,458
Restructuring charges, net |  |  |  |  |  |  |  |  |  | 1,151 | 816 | 3,583
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 86,198 | 75,665 | 68,041
Identifiable assets | [1] | 327,446 |  |  |  | 295,865 |  |  |  | 327,446 | 295,865 | 209,079
Long-lived assets | [1] | 17,271 |  |  |  | 18,647 |  |  |  | 17,271 | 18,647 | 19,167
Goodwill | [1] | 49,603 |  |  |  | 52,086 |  |  |  | 49,603 | 52,086 | 54,513
Operating Segments | Executive Recruitment | EMEA |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  | 153,465 | 147,917 | 128,807
Total revenue |  |  |  |  |  |  |  |  |  | 158,052 | 152,525 | 132,988
Operating income |  |  |  |  |  |  |  |  |  | 18,867 | 23,168 | 9,173
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,764 | 2,727 | 2,347
Other income (loss), net |  |  |  |  |  |  |  |  |  | 83 | 632 | 95
EBITDA |  |  |  |  |  |  |  |  |  | 20,714 | 26,527 | 11,615
Restructuring charges, net |  |  |  |  |  |  |  |  |  | 3,987 | 460 | 3,982
Separation costs |  |  |  |  |  |  |  |  |  |  |  | 516
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 24,701 | 26,987 | 16,113
Identifiable assets | [1] | 156,072 |  |  |  | 157,610 |  |  |  | 156,072 | 157,610 | 148,491
Long-lived assets | [1] | 3,885 |  |  |  | 5,515 |  |  |  | 3,885 | 5,515 | 6,312
Goodwill | [1] | 45,922 |  |  |  | 51,557 |  |  |  | 45,922 | 51,557 | 50,264
Operating Segments | Executive Recruitment | Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  | 84,148 | 84,816 | 73,221
Total revenue |  |  |  |  |  |  |  |  |  | 87,142 | 87,606 | 75,359
Operating income |  |  |  |  |  |  |  |  |  | 14,631 | 17,274 | 6,973
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,045 | 1,383 | 1,546
Other income (loss), net |  |  |  |  |  |  |  |  |  | 369 | 203 | 200
EBITDA |  |  |  |  |  |  |  |  |  | 16,045 | 18,860 | 8,719
Restructuring charges, net |  |  |  |  |  |  |  |  |  | 17 | 60 | 629
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 16,062 | 18,920 | 9,348
Identifiable assets | [1] | 94,099 |  |  |  | 83,292 |  |  |  | 94,099 | 83,292 | 72,303
Long-lived assets | [1] | 4,235 |  |  |  | 2,978 |  |  |  | 4,235 | 2,978 | 2,784
Goodwill | [1] | 972 |  |  |  | 972 |  |  |  | 972 | 972 | 972
Operating Segments | Executive Recruitment | South America |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  | 29,160 | 29,374 | 30,134
Total revenue |  |  |  |  |  |  |  |  |  | 29,218 | 29,586 | 30,491
Operating income |  |  |  |  |  |  |  |  |  | 4,704 | 5,654 | 5,987
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 350 | 323 | 372
Other income (loss), net |  |  |  |  |  |  |  |  |  | 109 | 303 | 32
EBITDA |  |  |  |  |  |  |  |  |  | 5,163 | 6,280 | 6,391
Restructuring charges, net |  |  |  |  |  |  |  |  |  | 229 |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 5,392 | 6,280 | 6,391
Identifiable assets | [1] | 25,328 |  |  |  | 25,587 |  |  |  | 25,328 | 25,587 | 23,616
Long-lived assets | [1] | 966 |  |  |  | 1,168 |  |  |  | 966 | 1,168 | 894
Operating Segments | LTC |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  | 267,018 | 254,636 | 168,115
Total revenue |  |  |  |  |  |  |  |  |  | 275,220 | 262,962 | 176,566
Operating income |  |  |  |  |  |  |  |  |  | 28,175 | 23,847 | 6,424
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 13,427 | 12,491 | 6,012
Other income (loss), net |  |  |  |  |  |  |  |  |  | (22) | 106 | (75)
EBITDA |  |  |  |  |  |  |  |  |  | 41,580 | 36,444 | 12,361
Restructuring charges, net |  |  |  |  |  |  |  |  |  | 2,758 | 1,149 | 10,198
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 44,338 | 37,593 | 22,559
Identifiable assets | [1] | 265,546 |  |  |  | 255,590 |  |  |  | 265,546 | 255,590 | 248,611
Long-lived assets | [1] | 12,377 |  |  |  | 11,976 |  |  |  | 12,377 | 11,976 | 10,383
Goodwill | [1] | 129,549 |  |  |  | 119,350 |  |  |  | 129,549 | 119,350 | 119,090
Operating Segments | Futurestep |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  | 163,727 | 136,790 | 122,237
Total revenue |  |  |  |  |  |  |  |  |  | 171,521 | 141,407 | 128,304
Operating income |  |  |  |  |  |  |  |  |  | 19,940 | 13,352 | 10,975
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,882 | 1,797 | 1,180
Other income (loss), net |  |  |  |  |  |  |  |  |  | 54 | 583 | 51
EBITDA |  |  |  |  |  |  |  |  |  | 21,876 | 15,732 | 12,206
Restructuring charges, net |  |  |  |  |  |  |  |  |  | 1,154 | 1,134 | 3,527
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 23,030 | 16,866 | 15,733
Identifiable assets | [1] | 103,782 |  |  |  | 111,036 |  |  |  | 103,782 | 111,036 | 93,331
Long-lived assets | [1] | 4,204 |  |  |  | 2,550 |  |  |  | 4,204 | 2,550 | 2,523
Goodwill | [1] | 28,394 |  |  |  | 33,617 |  |  |  | 28,394 | 33,617 | 32,454
Corporate |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | (53,107) | (61,943) | (54,488)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 5,614 | 3,872 | 2,821
Other income (loss), net |  |  |  |  |  |  |  |  |  | 6,577 | 7,311 | 5,540
Equity in earnings of unconsolidated subsidiaries, net |  |  |  |  |  |  |  |  |  | 1,755 | 1,786 | 1,676
EBITDA |  |  |  |  |  |  |  |  |  | (39,161) | (48,974) | (44,451)
Restructuring charges, net |  |  |  |  |  |  |  |  |  | 172 | 63 | 938
Integration/acquisition costs |  |  |  |  |  |  |  |  |  |  |  | 3,106
Acquisition costs |  |  |  |  |  |  |  |  |  | 959 |  |
Separation costs |  |  |  |  |  |  |  |  |  |  | 4,500 |
Integration costs |  |  |  |  |  |  |  |  |  |  | 394 |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | (38,030) | (44,017) | (40,407)
Identifiable assets | [1] | 345,528 |  |  |  | 304,686 |  |  |  | 345,528 | 304,686 | 319,798
Long-lived assets | [1] | $ 19,150 |  |  |  | $ 17,600 |  |  |  | $ 19,150 | $ 17,600 | $ 11,565
[1] | As of the end of the fiscal year.

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