Goodwill and Other Intangibles - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
Aug. 31, 2020	Aug. 31, 2019	May 31, 2020	May 31, 2019
Goodwill and Other Intangibles (Details) [Line Items]
Additions	$ 0	$ 0	$ 0
Goodwill, Impairment Loss	0	0	0
Amortizable intangible assets acquired	0	0	1,600,000
Goodwill, Impaired, Accumulated Impairment Loss			39,600,000	$ 39,600,000
Amortization expense	$ 600,000	800,000	3,200,000
Useful life	5 years 9 months 18 days
Impairment of Intangible Assets (Excluding Goodwill)	$ 0	$ 0	0
U.S. Based Book Business [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Amortizable intangible assets acquired			$ 1,600,000

-- None. No documentation exists for this element. --

No definition available.

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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

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Paragraph 1
-Subparagraph (a)(1)
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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

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