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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Valuation Allowance, Deferred Tax Asset, Change in Amount $ 1,200  
Undistributed Earnings of Foreign Subsidiaries 7,900 $ 10,300
U.S.    
Operating Loss Carryforwards 0  
Tax Credit Carryforwards 753 0
State    
Operating Loss Carryforwards 3,400 $ 76,000
Tax Credit Carryforwards 1,000  
Unlimited carryover 50  
U.K.    
Operating Loss Carryforwards $ 12,300