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Summary of Significant Accounting Policies - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]      
Property and equipment $ 7,975 $ 21,454  
Indefinite-lived intangibles   43,948  
Indefinite-lived intangibles 16,575 2,996  
Definite-lived intangibles 1,682 8,220  
Goodwill   6,881  
Goodwill   1,084  
Current assets   696  
Goodwill      
Defined Benefit Plan Disclosure [Line Items]      
Unrealized Gain (Loss/Impairments) Recognized (8,861) (4,239) $ (566)
Property and equipment      
Defined Benefit Plan Disclosure [Line Items]      
Unrealized Gain (Loss/Impairments) Recognized (10,582) (58) (1,029)
Indefinite-lived intangibles      
Defined Benefit Plan Disclosure [Line Items]      
Unrealized Gain (Loss/Impairments) Recognized (11,243) (5,516) (293)
Definite-lived intangibles      
Defined Benefit Plan Disclosure [Line Items]      
Unrealized Gain (Loss/Impairments) Recognized (1,283) (1,813) 0
Operating lease right-of-use assets      
Defined Benefit Plan Disclosure [Line Items]      
Unrealized Gain (Loss/Impairments) Recognized (6,480) (1,003) 0
Other assets      
Defined Benefit Plan Disclosure [Line Items]      
Unrealized Gain (Loss/Impairments) Recognized (68) 0 $ 0
Quoted Prices in Active Markets for Identical Asset (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Property and equipment 0 0  
Indefinite-lived intangibles   0  
Indefinite-lived intangibles 0 0  
Definite-lived intangibles 0 0  
Goodwill   0  
Goodwill   0  
Current assets   0  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Property and equipment 0 0  
Indefinite-lived intangibles   0  
Indefinite-lived intangibles 0 0  
Definite-lived intangibles 0 0  
Goodwill   0  
Goodwill   0  
Current assets   0  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Property and equipment 7,975 21,454  
Indefinite-lived intangibles   43,948  
Indefinite-lived intangibles 16,575 2,996  
Definite-lived intangibles $ 1,682 8,220  
Goodwill   6,881  
Goodwill   1,084  
Current assets   $ 696