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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
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Equity [Abstract]      
Weighted-average shares outstanding used to compute basic EPS 68.3 70.0 71.3
Effect of dilutive stock options 0.5 3.4 3.2
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS 68.8 73.4 74.5