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- Schedule of activity in goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2018 | Aug. 31, 2017 | May 31, 2018 | May 31, 2017 | May 31, 2016
Goodwill [Roll Forward] |  |  |  |  |
Gross goodwill |  |  | $ 158.8 | $ 158.5 | $ 158.5
Accumulated impairment | $ (39.6) | $ (39.6) | (39.6) | $ (39.6) | $ (39.6)
Beginning balance | 119.2 | 118.9 | 118.9 |  |
Foreign currency translation | (0.1) | 0.3 | 0.2 |  |
Other | 0.0 | 0.0 | 0.1 |  |
Ending balance | $ 119.1 | $ 119.2 | $ 119.2 |  |

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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