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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, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]        
Weighted-average shares outstanding used to compute basic EPS 68.2 70.5 68.5 69.6
Effect of dilutive shares 0.1 3.3 0.4 3.5
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS 68.3 73.8 68.9 73.1