Quarterly report pursuant to Section 13 or 15(d)

Leases (Narrative) (Details)

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Leases (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2019
USD ($)
item
Nov. 30, 2019
USD ($)
item
May 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]      
Fixed payment operating lease expense $ 9.6 $ 19.7 $ 42.9
Number of lease agreements, not yet commenced | item 2 2  
Lease payments, not yet commenced $ 5.2 $ 5.2  
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Operating leases, remaining term of contract 1 year 1 year  
Operating leases, contractual term   2019  
Operating leases, renewal term 1 year 1 year  
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Operating leases, remaining term of contract 10 years 10 years  
Operating leases, contractual term   2029  
Operating leases, renewal term 5 years 5 years  
Lease not yet commenced, term of contract 9 years 9 years