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Goodwill and Other Intangibles - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 29, 2020 | Aug. 31, 2018 | Feb. 29, 2020 | Feb. 28, 2019 | May 31, 2018 | May 31, 2019 | May 31, 2017
Goodwill and Other Intangibles (Details) [Line Items] |  |  |  |  |  |  |
Additions |  |  | $ 0.0 | $ 0.0 | $ 6.3 |  |
Amortizable intangible assets acquired |  |  | 1.6 | 0.6 | 4.5 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  |  | $ 39.6 | $ 39.6
Amortization expense |  |  | $ 2.4 | $ 2.0 | $ 2.8 |  |
Useful life |  |  | 5 years 2 months 12 days |  |  |  |
U.S. Based Book Business [Member] |  |  |  |  |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |  |  |  |  |
Amortizable intangible assets acquired | $ 1.6 |  |  |  |  |  |
U.K. Based Book Business [Member] |  |  |  |  |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |  |  |  |  |
Amortizable intangible assets acquired |  | $ 0.6 |  |  |  |  |
Make Believe Ideas Limited (MBI) |  |  |  |  |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  |  | $ 3.9 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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