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Income Taxes - Summary of Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 01, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset        
Valuation Allowance [Roll Forward]        
Balance at beginning of period $ 38,407 $ 25,673 $ 23,112 $ 38,407
Additions (reductions) to income tax   (5,947) 2,561 (5,555)
Write-offs   (2,277) 0 (9,740)
Balance at end of period   17,449 25,673 23,112
Write-offs   2,277 $ 0 $ 9,740
Deferred Tax Asset Related to ASC 606 Adoption        
Valuation Allowance [Roll Forward]        
Write-offs (9,600)      
Write-offs $ 9,600      
Deferred Tax Asset Related to ASC 842 Adoption        
Valuation Allowance [Roll Forward]        
Write-offs   (2,300)    
Write-offs   $ 2,300