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Post-employment Benefits - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Postemployment Benefits Disclosure [Line Items]      
Post-employment benefit charges $ 1,100 $ 2,280 $ 1,727
Cash paid   $ 2,261 $ 1,187
Minimum      
Postemployment Benefits Disclosure [Line Items]      
Payment term for post-employment benefit liability   1 month  
Maximum      
Postemployment Benefits Disclosure [Line Items]      
Payment term for post-employment benefit liability   24 months  
Former President and Chief Executive Officer      
Postemployment Benefits Disclosure [Line Items]      
Post-employment benefit charges   $ 1,500  
Cash paid   $ 1,200