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Stock-Based Compensation (Summary of Restricted Stock Units Activity) (Detail) - Restricted Stock Units - $ / shares
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted Stock Units Outstanding at beginning of period 767,973  
Restricted Stock Units Outstanding, Shares Granted 332,890  
Restricted Stock Units Outstanding, Shares Vested (340,846)  
Restricted Stock Units Outstanding, Shares Forfeited (7,831)  
Restricted Stock Units Outstanding at end of period 752,186  
Weighted Average Grant Date Fair Value, Nonvested beginning balance $ 39.42  
Weighted Average Grant Date Fair Value, Shares Granted 32.02 $ 43.39
Weighted Average Grant Date Fair Value, Shares Vested 35.08  
Weighted Average Grant Date Fair Value, Shares Forfeited 37.70  
Weighted Average Grant Date Fair Value, Nonvested ending balance $ 38.13