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Summary of Significant Accounting Policies - Concentration of Credit Risk and Revenue Recognition - Additional Information (Details) - Customer
3 Months Ended 9 Months Ended
Nov. 30, 2018
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2019
Aug. 31, 2018
Sales Revenue, Net | Customer Concentration Risk          
Concentration Risk [Line Items]          
Concentration Risk, Percentage   21.00% 16.00% 19.00% 17.00%
Number of customers accounted for 10% or more of consolidated revenue   1 1 1 1
Sales Revenue, Net | Supplier Concentration Risk | HP Inc          
Concentration Risk [Line Items]          
Concentration Risk, Percentage   12.00% 13.00% 12.00% 13.00%
Accounts Receivable | Customer Concentration Risk          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 11.00%     21.00%  
Number of customers exceeded 10 percent of total consolidated accounts receivable 1 1   1