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Fair Value Measurements - Additional Disclosures (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 08, 2021
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Additional contingent payments     $ 4,608 $ 0 $ 0  
Amount received in previously escrowed seller funds   $ 1,100        
Secured Promissory Note 2.89%, Due 2024            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of notes receivable $ 1,100          
Notes receivable, interest rate 2.89%          
Rich Data Corporation            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Ownership percentage after dilution     0.1314 0.1314 0.1314  
Bajio            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Additional contingent payments           $ 4,600