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Summary of Significant Accounting Policies - Schedule of Significant Unobservable Inputs Used in Level 3 Fair Value Measurement (Details) - Significant Unobservable Inputs (Level 3)
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Property and equipment | Discounted cash flow | EBITDA multiple | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 1 9 8
Property and equipment | Discounted cash flow | EBITDA multiple | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 12 10 8
Property and equipment | Discounted cash flow | EBITDA multiple | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 11 10 8
Property and equipment | Discounted cash flow | Revenue/EBITDA growth rate | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0 0 0
Property and equipment | Discounted cash flow | Revenue/EBITDA growth rate | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.025 0.025 0.025
Property and equipment | Discounted cash flow | Revenue/EBITDA growth rate | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.0125 0.015 0.01
Property and equipment | Discounted cash flow | Weighted average cost of capital | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.13
Property and equipment | Discounted cash flow | Weighted average cost of capital | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.17
Property and equipment | Discounted cash flow | Weighted average cost of capital | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.110 0.125 0.15
Goodwill | Discounted cash flow | EBITDA multiple | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 9 8 8
Goodwill | Discounted cash flow | EBITDA multiple | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 12 10 8
Goodwill | Discounted cash flow | EBITDA multiple | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 12 9 8
Goodwill | Discounted cash flow | Revenue/EBITDA growth rate | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0 0 0
Goodwill | Discounted cash flow | Revenue/EBITDA growth rate | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.025 0.025 0.025
Goodwill | Discounted cash flow | Revenue/EBITDA growth rate | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.025 0.015 0.01
Goodwill | Discounted cash flow | Weighted average cost of capital | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.13
Goodwill | Discounted cash flow | Weighted average cost of capital | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.17
Goodwill | Discounted cash flow | Weighted average cost of capital | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.15
SOB licenses | Multiperiod excess earnings | EBITDA multiple | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 12 9 8
SOB licenses | Multiperiod excess earnings | EBITDA multiple | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input   10 8
SOB licenses | Multiperiod excess earnings | EBITDA multiple | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 12 10 8
SOB licenses | Multiperiod excess earnings | Revenue/EBITDA growth rate | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0 0 0
SOB licenses | Multiperiod excess earnings | Revenue/EBITDA growth rate | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input   0.025 0.025
SOB licenses | Multiperiod excess earnings | Revenue/EBITDA growth rate | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.025 0.015 0.01
SOB licenses | Multiperiod excess earnings | Weighted average cost of capital | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.13
SOB licenses | Multiperiod excess earnings | Weighted average cost of capital | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.17
SOB licenses | Multiperiod excess earnings | Weighted average cost of capital | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.15
SOB licenses | Multiperiod excess earnings | Contributory asset charges rate | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.10 0.005 0.014
SOB licenses | Multiperiod excess earnings | Contributory asset charges rate | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.215 0.074 0.080
SOB licenses | Multiperiod excess earnings | Contributory asset charges rate | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.15 0.023 0.04
Tradename | Relief-from-royalty method | Weighted average cost of capital | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.15
Tradename | Relief-from-royalty method | Weighted average cost of capital | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.15
Tradename | Relief-from-royalty method | Weighted average cost of capital | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.15
Tradename | Relief-from-royalty method | Revenue growth rate | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0 0 0
Tradename | Relief-from-royalty method | Revenue growth rate | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input   0.025 0.025
Tradename | Relief-from-royalty method | Revenue growth rate | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.025 0.015 0.025
Tradename | Relief-from-royalty method | Terminal multiple | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 12 9 8
Tradename | Relief-from-royalty method | Terminal multiple | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input   10 8
Tradename | Relief-from-royalty method | Terminal multiple | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 12 9 8
Tradename | Relief-from-royalty method | Royalty rate | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.03 0.035  
Tradename | Relief-from-royalty method | Royalty rate | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.06 0.045  
Tradename | Relief-from-royalty method | Royalty rate | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.047 0.04  
Operating lease right-of-use assets | Discounted cash flow | Weighted average cost of capital | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.13
Operating lease right-of-use assets | Discounted cash flow | Weighted average cost of capital | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.17
Operating lease right-of-use assets | Discounted cash flow | Weighted average cost of capital | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.11 0.125 0.15
Operating lease right-of-use assets | Discounted cash flow | EBITDA growth rate | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.015 0 0
Operating lease right-of-use assets | Discounted cash flow | EBITDA growth rate | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.025 0.025 0.025
Operating lease right-of-use assets | Discounted cash flow | EBITDA growth rate | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.023 0.015 0.01
Business combinations | Various | Weighted average cost of capital | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.165 0.15  
Business combinations | Various | Weighted average cost of capital | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.180 0.195  
Business combinations | Various | Weighted average cost of capital | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.178 0.181  
Business combinations | Various | Contributory asset charges rate | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.156 0.085  
Business combinations | Various | Contributory asset charges rate | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.215 0.102  
Business combinations | Various | Contributory asset charges rate | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.163 0.093  
Business combinations | Various | EBITDA growth rate | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0 0.025  
Business combinations | Various | EBITDA growth rate | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.112 0.10  
Business combinations | Various | EBITDA growth rate | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.055 0.048  
Business combinations | Various | Internal rate of return | Minimum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.165 0.15  
Business combinations | Various | Internal rate of return | Maximum      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.300 0.215  
Business combinations | Various | Internal rate of return | Weighted Average      
Property, Plant and Equipment [Line Items]      
Asset fair value, measurement input 0.224 0.194