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Equity-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total compensation costs related to unvested awards not yet recognized for all plans presented       $ 48.0    
Tax benefit recognized on vested performance stock units, restricted stock units and stock options exercised       $ 24.0 $ 16.0 $ 9.0
Number of shares, Granted       4,468,000 5,445,000 3,510,000
Number of shares, Vested       5,565,000 3,534,000 1,467,000
Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares, Granted       2,100,000 6,000,000.0 4,400,000
Number of shares, Vested       6,300,000 4,200,000 1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Measurement Period       3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Total Stock Return Period       3 years    
Performance Stock Units | Certain Participants [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Measurement Period   1 year        
Settled In Cash | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares, Vested       1,600,000 1,100,000 500,000
Cash used to settle awards       $ 20.9 $ 15.4 $ 6.6
Settled In Cash | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cash used to settle awards       $ 0.9    
Settled In Stock | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares, Granted       1,200,000 4,300,000 3,200,000
Settled In Stock | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares, Granted       3,300,000 1,100,000 300,000
Cash used to settle awards       $ 4.2 $ 1.1 $ 0.3
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average future expense period of unrecognized stock-based compensation expense (years)       1 year    
Minimum | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total number of shares issued, percentage 0.00%   0.00%      
Minimum | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (years)       1 year    
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average future expense period of unrecognized stock-based compensation expense (years)       2 years    
Maximum | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total number of shares issued, percentage 200.00%   200.00%      
Maximum | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (years)       4 years    
Class A Common Stock | 2013 LTIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award shares authorized       50,000,000