Leases (Narrative) (Details) $ in Millions  | 
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
| 
 Aug. 31, 2020  
USD ($) 
 | 
 May 31, 2022  
USD ($)  
Agreement 
 | 
 May 31, 2021  
USD ($) 
 | 
 May 31, 2020  
USD ($) 
 | 
|
| Lessee, Lease, Description [Line Items] | ||||
| Amortization of operating lease ROU assets | $ 24.4 | $ 22.7 | $ 29.2 | $ 34.4 | 
| Number of lease agreements, not yet commenced | Agreement | 1 | |||
| Lease not yet commenced, term of contract | 10 years | |||
| Lease payments, not yet commenced | $ 1.8 | |||
| Minimum [Member] | ||||
| Lessee, Lease, Description [Line Items] | ||||
| Operating leases, term of contract | 1 year | |||
| Operating leases, contractual term | 2022 | |||
| Operating leases, renewal term | 1 year | |||
| Maximum [Member] | ||||
| Lessee, Lease, Description [Line Items] | ||||
| Operating leases, term of contract | 10 years | |||
| Operating leases, contractual term | 2032 | |||
| Operating leases, renewal term | 5 years | |||
| X | ||||||||||
- Definition Lessee Operating Lease Liability Payments Not Yet Commenced No definition available. 
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| X | ||||||||||
- Definition Lessee Operating Lease Term Expiration Year No definition available. 
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| X | ||||||||||
- Definition Lessee Operating Number Of Leases Not Yet Commenced No definition available. 
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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| X | ||||||||||
- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
- Definition Amount of amortization expense for right-of-use asset from operating lease. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
- Details 
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| X | ||||||||||
- Details 
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