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Equity-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
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       $ 70.0    
Tax benefit recognized on vested performance stock units, restricted stock units and stock options exercised       $ 18.0 $ 24.0 $ 16.0
Number of shares, Granted       3,546,000 4,468,000 5,445,000
Number of shares, Vested       3,676,000 5,565,000 3,534,000
Intrinsic value of unvested RSUs and target PSUs       $ 275.0    
Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award performance measurement period       3 years    
TSR period       3 years    
Number of shares, Granted       1,600,000 2,100,000 6,000,000.0
Number of shares, Vested       3,600,000 6,300,000 4,200,000
Performance Stock Units | Settled In Cash            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares, Vested       1,200,000 1,600,000 1,100,000
Cash used to settle awards       $ 18.0 $ 21.0 $ 15.0
Performance Stock Units | Settled In Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares, Granted       800,000 1,200,000 4,300,000
Performance Stock Units | Certain Participants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award performance measurement period   1 year        
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares, Vested       1,600,000    
Cash used to settle awards       $ 4.0    
Restricted Stock Units | Settled In Cash            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares, Vested       300,000    
Cash used to settle awards       $ 1.0 $ 0.9  
Restricted Stock Units | Settled In Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares, Granted       2,400,000 3,300,000 1,100,000
Cash used to settle awards       $ 3.4 $ 4.2 $ 1.1
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%      
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)       3 years    
Class A Common Stock | 2013 LTIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award shares authorized       50,000,000