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Fair Value Measurements - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Fair Value Disclosures [Abstract]          
Fair value, assets, level 1 to level 2 transfers $ 0 $ 0 $ 0 $ 0  
Fair value, assets, level 2 to level 1 transfers 0 0 0 0  
Fair value, assets, level 2 to level 3 transfers 0 0 0 0  
Fair value, assets, level 3 to level 2 transfers 0 0 0 0  
Fair value, assets, level 1 to level 3 transfers   0   0  
Fair value, assets, level 3 to level 1 transfers 0   0    
Fair value, liabilities, level 1 to level 2 transfers 0 0 0 0  
Fair value, liabilities, level 2 to level 1 transfers 0 0 0 0  
Fair value, liabilities, level 2 to level 3 transfers 0 0 0 0  
Fair value, liabilities, level 3 to level 2 transfers 0 0 0 0  
Fair value, liabilities, level 1 to level 3 transfers 0 0 0 0  
Fair value, liabilities, level 3 to level 1 transfers 0 0 0 0  
Reclassified out of accumulated other comprehensive income 0 $ 0 0 $ 0  
Contingent consideration liabilities $ 79,600,000   $ 79,600,000   $ 6,400,000