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Revenue Recognition - Remaining Performance Obligations (Details)
$ in Thousands
Jul. 31, 2020
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 78,487
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-08-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, percentage 75.00%
Remaining performance obligation, satisfaction period 12 months