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Preferred and Common Stockholder's Equity - Schedule of Anti-Dilutive Options and Restricted Stock Units Excluded from EPS Computation (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]        
Anti-dilutive options and RSU's excluded from EPS computation 0.2 8.7 0.5 6.4