CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 25, 2015	Apr. 25, 2015	Jan. 24, 2015	Oct. 25, 2014	Jul. 26, 2014	Apr. 26, 2014	Jan. 25, 2014	Oct. 26, 2013	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 33,827	$ 20,258	$ 9,432	$ 20,807	$ 16,489	$ 7,895	$ (3,067)	$ 18,660	$ 84,324	$ 39,978	$ 35,188
Foreign currency translation losses, net of tax									(1,040)	(261)	(35)
Comprehensive income									$ 83,284	$ 39,717	$ 35,153