CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Oct. 27, 2018	Oct. 28, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 6,269	$ 3,016
Other comprehensive income:
Amortization of pension actuarial loss, net of tax	102	84
Comprehensive income	$ 6,371	$ 3,100