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Preferred and Common Stockholder's Equity - Reconciliation of Denominators of Basic and Diluted Earnings Per Share Computations (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]        
Weighted-average shares outstanding used to compute basic EPS 70.5 72.5 69.6 72.6
Effect of dilutive shares 3.3 2.9 3.5 3.2
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS 73.8 75.4 73.1 75.8