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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, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]        
Anti-dilutive options and RSU's excluded from EPS computation 0.9 1.1 1.3 0.6