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Preferred and Common Stockholder's Equity - Summary of Common Shares Issued and Outstanding (Detail) - shares
shares in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
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 4.1 2.2
Common stock issued, Ending balance 74.7 70.6
Common stock outstanding, Ending balance 74.7 70.6