Common Stock Repurchase Program (Detail) - Common Stock - USD ($)	3 Months Ended		12 Months Ended
	Jul. 31, 2016	Aug. 02, 2015	May 01, 2016	Jun. 15, 2016
Stockholders Equity Note [Line Items]
Common stock repurchased			100,776
Common Stock Repurchase Program June 15, 2016 [Member]
Stockholders Equity Note [Line Items]
Authorization amount for repurchase of common stock				$ 5,000,000
Common stock repurchased	0	0
Remaining authorized repurchase amount	$ 5,000,000