Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Service Revenue (Narrative) (Performance Obligation) (Details)
$ in Millions
Feb. 28, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-06-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Deferred revenue, performance obligations $ 6.8
Deferred revenue, timing of satisfaction 3 months
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 $ 20.6
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 $ 18.7
Deferred revenue, timing of satisfaction