Quarterly report pursuant to Section 13 or 15(d)

Customer and Supplier Concentrations - Summary of Customer and Supplier Concentration of Revenue (Details)

v3.19.3
Customer and Supplier Concentrations - Summary of Customer and Supplier Concentration of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Concentration Risk [Line Items]      
Revenues $ 1,481,014 $ 1,565,090  
Customer concentrations      
Concentration Risk [Line Items]      
Revenues $ 1,481,014 $ 1,565,090  
Concentration risk, percentage 100.00% 100.00% 100.00%
Revenue | Customer concentrations      
Concentration Risk [Line Items]      
Revenues $ 572,234 $ 381,928  
Concentration risk, percentage 38.60% 24.40%  
HSBC Bank USA | Revenue | Customer concentrations      
Concentration Risk [Line Items]      
Revenues $ 272,199 $ 380,122  
Concentration risk, percentage 18.40% 24.30%  
TD Securities | Revenue | Customer concentrations      
Concentration Risk [Line Items]      
Revenues $ 300,035 $ 1,806  
Concentration risk, percentage 20.20% 0.10%