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Equity-Based Compensation - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
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       $ 52.0    
Tax benefit recognized on vested performance stock units, restricted stock units and stock options exercised       $ 16.0 $ 9.0 $ 17.0
Stock units granted [1]       5,445 3,510 4,502
Stock based compensation award, vested [2]       3,534 1,467 2,387
Performance Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock units granted       6,000 4,400 5,500
Stock based compensation award, vested       4,200 1,600 2,800
Settled In Cash [Member] | Performance Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock based compensation award, vested       1,100 500 1,000
Stock based compensation award       $ 15.4 $ 6.6 $ 13.1
Settled In Stock [Member] | Performance Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock units granted       3,800 3,200 4,100
Stock based compensation award       $ 1.1 $ 0.3 $ 0.4
Settled In Stock [Member] | Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock units granted       1,100 300 400
Minimum [Member]            
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 [Member] | Performance Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total number of shares issued, percentage 0.00% 0.00% 0.00%      
Minimum [Member] | Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (years)       2 years    
Maximum [Member]            
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 [Member] | Performance Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total number of shares issued, percentage 200.00% 200.00% 200.00%      
Maximum [Member] | Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (years)       4 years    
Class A Common Stock [Member] | 2013 LTIP [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award shares authorized       30,000    
[1] For fiscal 2019, includes 3.8 million target PSUs and 1.1 million RSUs granted and a payout adjustment of 0.5 million PSUs due to the actual performance level achieved for PSUs granted in fiscal 2018 that vested during fiscal 2019. For fiscal 2018, includes 3.2 million target PSUs and 0.3 million RSUs granted. For fiscal 2017, includes 4.1 million target PSUs and 0.4 million RSUs granted.
[2] The fair value of PSUs and RSUs held by the Company’s employees that vested during the fiscal years ended June 30, 2019, 2018 and 2017 was $52 million, $25 million and $44 million, respectively. For fiscal 2019, includes 0.6 million of target PSUs and 0.1 million RSUs cancelled and a payout adjustment of 0.3 million PSUs due to the actual performance level achieved for PSUs granted in fiscal 2016 that vested during fiscal 2019. For fiscal 2018, includes 0.6 million of target PSUs and 0.1 million RSUs cancelled and a payout adjustment of 0.7 million PSUs due to the actual performance level achieved for PSUs granted in fiscal 2015 that vested during fiscal 2018. For fiscal 2017, includes 0.7 million of target PSUs and 0.1 million RSUs cancelled and a payout adjustment of 0.4 million PSUs due to the actual performance level achieved for PSUs granted in fiscal 2014 that vested during fiscal 2017.