Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2007
Equity [Abstract]
Repurchase authorization, shares	379	379	10,000,000
Shares remaining available for repurchase under the current authorization	1,600,000
Cash dividends paid to common stockholders	$ 40	$ 39