Preferred and Common Stockholder's Equity - Summary of Common Shares Issued and Outstanding (Detail) - shares shares in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Class of Stock [Line Items]
Common stock issued, Beginning balance	73.5	80.6	82.6
Common stock outstanding, Beginning balance	73.5	80.6	82.6
Common stock issued upon exercise of options and employee stock plans	1.4	3.3	3.6
Repurchase and retirement of common stock	(6.0)	(10.4)	(5.6)
Common stock issued, Ending balance	68.9	73.5	80.6
Common stock outstanding, Ending balance	68.9	73.5	80.6