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Organization and Summary of Significant Accounting Policies - Reconciliation of Denominators of Basic and Diluted Earnings Per Share Computations (Detail) - shares
shares in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Equity [Abstract]                        
Weighted-average shares outstanding used to compute basic EPS 70.1 69.8 69.3 68.6 68.2 68.1 68.2 68.8 69.4 68.3 70.0 71.3
Effect of dilutive stock options                 2.6 0.5 3.4  
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS 72.9 72.4 71.9 70.4 68.9 68.3 68.3 68.8 72.0 68.8 73.4 74.5