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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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May 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets | As of May 31, 2018 and 2017, intangible assets consisted of the following:
| May 31, 2018
| Gross carrying value |  | Accumulated amortization |  | Net carrying value
(in thousands) |
Product technologies | $ | 147,175 |  |  | $ | (68,880 | ) |  | $ | 78,295 |
Customer relationships | 56,428 |  |  | (23,237 | ) |  | 33,191 |
Trademarks | 28,400 |  |  | (11,809 | ) |  | 16,591 |
Licenses | 5,752 |  |  | (4,357 | ) |  | 1,395 |
Distributor relationships | 1,250 |  |  | (412 | ) |  | 838 |
| $ | 239,005 |  |  | $ | (108,695 | ) |  | $ | 130,310 |
| May 31, 2017
| Gross carrying value |  | Accumulated amortization |  | Net carrying value
(in thousands) |
Product technologies | $ | 147,172 |  |  | $ | (59,696 | ) |  | $ | 87,476 |
Customer relationships | 56,375 |  |  | (19,194 | ) |  | 37,181 |
Trademarks | 28,400 |  |  | (9,069 | ) |  | 19,331 |
Licenses | 4,487 |  |  | (3,821 | ) |  | 666 |
Distributor relationships | 1,250 |  |  | (229 | ) |  | 1,021 |
| $ | 237,684 |  |  | $ | (92,009 | ) |  | $ | 145,675 |
Expected amortization expense | Annual amortization of these intangible assets is expected to approximate the following amounts for each of the next five fiscal years:
(in thousands) |
2019 | $ | 16,555 |
2020 | 15,001 |
2021 | 13,842 |
2022 | 12,958 |
2023 | 12,507 |
2024 and thereafter | 59,447 |
| $ | 130,310 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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