Quarterly report pursuant to Section 13 or 15(d)

Service Revenue (Narrative) (Performance Obligation) (Details)

v3.19.3
Service Revenue (Narrative) (Performance Obligation) (Details)
$ in Millions
Aug. 31, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-06-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Deferred revenue, performance obligations $ 17.5
Deferred revenue, timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-06-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Deferred revenue, performance obligations $ 16.3
Deferred revenue, timing of satisfaction 2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-06-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Deferred revenue, performance obligations $ 10.7
Deferred revenue, timing of satisfaction 3 years