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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
Sep. 30, 2015
Sep. 30, 2014
Equity [Abstract]    
Common stock issued, Beginning balance 68.9 73.5
Common stock outstanding, Beginning balance 68.9 73.5
Common stock issued upon exercise of options and employee stock plans 1.6 0.7
Repurchase and retirement of common stock (1.1) (1.2)
Common stock issued, Ending balance 69.4 73.0
Common stock outstanding, Ending balance 69.4 73.0