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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Apr. 30, 2017
Changes in Carrying Value of Goodwill by Reportable Segment | Changes in the carrying value of goodwill by reportable segment were as follows:
|  | Executive Search |  |  |  |  |  |  |  |  |  |
|  | North America |  |  | EMEA |  |  | Asia Pacific |  |  | Subtotal |  |  | Hay Group |  |  | Futurestep |  |  | Consolidated |
|  | (in thousands) |
Balance as of May 1, 2015. |  | $ | 49,603 |  |  | $ | 45,922 |  |  | $ | 972 |  |  | $ | 96,497 |  |  | $ | 129,549 |  |  | $ | 28,394 |  |  | $ | 254,440 |
Additions |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 335,921 |  |  |  | — |  |  |  | 335,921 |
Exchange rate fluctuations. |  |  | (1,283 | ) |  |  | 271 |  |  |  | — |  |  |  | (1,012 | ) |  |  | 467 |  |  |  | 256 |  |  |  | (289 | )
Balance as of April 30, 2016. |  |  | 48,320 |  |  |  | 46,193 |  |  |  | 972 |  |  |  | 95,485 |  |  |  | 465,937 |  |  |  | 28,650 |  |  |  | 590,072 |
Adjustments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (8,179 | ) |  |  | — |  |  |  | (8,179 | )
Exchange rate fluctuations. |  |  | (2,119 | ) |  |  | (1,217 | ) |  |  | — |  |  |  | (3,336 | ) |  |  | (517 | ) |  |  | (1,175 | ) |  |  | (5,028 | )
Balance as of April 30, 2017. |  | $ | 46,201 |  |  | $ | 44,976 |  |  | $ | 972 |  |  | $ | 92,149 |  |  | $ | 457,241 |  |  | $ | 27,475 |  |  | $ | 576,865 |
Intangible Assets | Intangible assets include the following:
|  | April 30, 2017 |  |  | April 30, 2016 |
|  | (in thousands) |
Amortized intangible assets: |  | Gross |  |  | Accumulated Amortization |  |  | Net |  |  | Gross |  |  | Accumulated Amortization |  |  | Net |
Customer lists |  | $ | 125,099 |  |  | $ | (31,094 | ) |  | $ | 94,005 |  |  | $ | 125,099 |  |  | $ | (19,910 | ) |  | $ | 105,189 |
Intellectual property |  |  | 33,100 |  |  |  | (16,994 | ) |  |  | 16,106 |  |  |  | 33,100 |  |  |  | (13,281 | ) |  |  | 19,819 |
Proprietary databases |  |  | 4,256 |  |  |  | (3,202 | ) |  |  | 1,054 |  |  |  | 4,256 |  |  |  | (2,777 | ) |  |  | 1,479 |
Trademarks |  |  | 3,986 |  |  |  | (3,986 | ) |  |  | — |  |  |  | 3,986 |  |  |  | (3,986 | ) |  |  | — |
Non-compete agreements |  |  | 910 |  |  |  | (833 | ) |  |  | 77 |  |  |  | 910 |  |  |  | (753 | ) |  |  | 157 |
Total |  | $ | 167,351 |  |  | $ | (56,109 | ) |  |  | 111,242 |  |  | $ | 167,351 |  |  | $ | (40,707 | ) |  |  | 126,644 |
Unamortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  |  | 106,000 |  |  |  |  |  |  |  |  |  |  |  | 106,000 |
Exchange rate fluctuations |  |  |  | 77 |  |  |  |  |  |  |  |  |  |  |  | 383 |
Total Intangible assets |  |  | $ | 217,319 |  |  |  |  |  |  |  |  |  |  | $ | 233,027 |
Estimated Annual Amortization Expense Related to Amortizing Intangible Assets | Estimated annual amortization expense related to amortizing intangible assets is as follows:
Year Ending April 30, |  | Estimated Annual Amortization Expense |
|  | (in thousands) |
2018 |  | $ | 14,742 |
2019 |  |  | 13,487 |
2020 |  |  | 13,204 |
2021 |  |  | 13,280 |
2022 |  |  | 13,269 |
Thereafter |  |  | 43,260 |
|  | $ | 111,242 |

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