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Stock-Based Compensation (Summary of Restricted Stock Units Activity) (Detail) - Restricted Stock Units - $ / shares
6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted Stock Units Outstanding at beginning of period 878,030  
Restricted Stock Units Outstanding, Shares Granted 394,870  
Restricted Stock Units Outstanding, Shares Vested (355,107)  
Restricted Stock Units Outstanding, Shares Forfeited (73,877)  
Restricted Stock Units Outstanding at end of period 843,916  
Weighted Average Grant Date Fair Value, Nonvested beginning balance $ 34.86  
Weighted Average Grant Date Fair Value, Shares Granted 42.66 $ 49.57
Weighted Average Grant Date Fair Value, Shares Vested 28.65  
Weighted Average Grant Date Fair Value, Shares Forfeited 39.42  
Weighted Average Grant Date Fair Value, Nonvested ending balance $ 39.21