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Summary of significant accounting policies (Tables)
3 Months Ended
Dec. 31, 2020
Summary of Cash, Cash Equivalents and Restricted Cash
(in thousands)
  
December
 
31,

2020
    
September 30,

2020
 
Cash and cash equivalents
   $ 348,789      $ 93,667  
Restricted cash, non-current
     1,530        579  
    
 
 
    
 
 
 
Total cash, cash equivalents and restricted cash
   $ 350,319      $ 94,246