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Fair Value Measurements - Summary of Changes in Fair Value of Contingent Consideration Liabilities Which Reflect Level 3 Inputs (Details) - Contingent Consideration Liabilities [Member] - Level 3 [Member] - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 12,364 $ 2,960
Additions from business acquisitions 6,030 8,200
Settlement of contingent consideration liabilities (3,000)  
Change in fair value and net present value of contingency 235 232
Ending Balance $ 15,629 $ 11,392