Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended		9 Months Ended
	Apr. 29, 2016	Feb. 28, 2016	Aug. 31, 2015	Mar. 31, 2016	May. 31, 2013
Class of Stock [Line Items]
Dividend declaration date				2016-02
Dividend payable date				Apr. 13, 2016
Dividend record date				Mar. 09, 2016
Subsequent Event [Member]
Class of Stock [Line Items]
Remaining authorized amount under stock repurchase program	$ 429,000,000
Class A Common Stock [Member]
Class of Stock [Line Items]
Aggregate amount of shares authorized to be repurchased					$ 500,000,000
Cash dividend declared		$ 0.10	$ 0.10
Class A Common Stock [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Number of shares repurchased	5.2
Aggregate cost of shares repurchased	$ 71,000,000
Class B Common Stock [Member]
Class of Stock [Line Items]
Cash dividend declared		$ 0.10	$ 0.10