Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended
	Oct. 27, 2015	Oct. 22, 2015	Sep. 30, 2015	Oct. 23, 2014
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares				2,000,000
Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased by the Company			1,134,300
Value of shares repurchased by the Company			$ 45.2
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, termination date		Oct. 22, 2015
Subsequent Event [Member] | 2015 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased by the Company	0
Common stock repurchase program, termination date		Dec. 31, 2016
Subsequent Event [Member] | 2015 Stock Repurchase Program [Member] | Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares		3,150,000