Basis of Presentation - Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-01	Aug. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, percentage	90.00%
Remaining performance obligation, expected timing of satisfaction, period	1 year
Minimum | Software licenses
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	1 year
Minimum | Maintenance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	1 year
Minimum | Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	1 year
Maximum | Software licenses
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	3 years
Maximum | Maintenance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	3 years
Maximum | Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	3 years