Quarterly report pursuant to Section 13 or 15(d)

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

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Service Revenue (Narrative) (Performance Obligation) (Details)
$ in Millions
Nov. 30, 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 $ 12.5
Deferred revenue, timing of satisfaction 6 months
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 $ 18.3
Deferred revenue, timing of satisfaction 1 year 6 months
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 $ 14.3
Deferred revenue, timing of satisfaction 2 years 6 months