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Share-Based Compensation - Schedule of Share-Based Compensation Arrangement by Share Based Payment Award Options Outstanding (Detail) - $ / shares
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Options outstanding at beginning of year, Number of shares 5,500,000    
Options granted, Number of shares 0 0 0
Options exercised, Number of shares (400,000)    
Options canceled or expired, Number of shares (300,000)    
Options outstanding at end of year, Number of shares 4,800,000 5,500,000  
Options exercisable at end of year, Number of shares 4,800,000    
Options vested and expected to vest, Number of shares 4,800,000    
Options outstanding at beginning of year, Weighted average exercise price $ 24.45    
Options exercised, Weighted average exercise price 22.56    
Options canceled or expired, Weighted average exercise price 26.69    
Options outstanding at end of year, Weighted average exercise price 24.47 $ 24.45  
Options exercisable at end of year, Weighted average exercise price 24.47    
Options vested and expected to vest, Weighted average exercise price $ 24.47