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Preferred and Common Stockholder's Equity - Summary of Common Shares Issued and Outstanding (Detail) - shares
shares in Millions
9 Months Ended 12 Months Ended
Mar. 31, 2019
Jun. 30, 2018
Equity [Abstract]    
Common stock issued, Beginning balance 70.6 68.4
Common stock outstanding, Beginning balance 70.6 68.4
Common stock issued upon exercise of options and employee stock plans 4.4 2.2
Repurchase and retirement of common stock (1.6)  
Common stock issued, Ending balance 73.4 70.6
Common stock outstanding, Ending balance 73.4 70.6