CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 26, 2019	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 7,571	$ 9,511	$ 13,839	$ 12,528
Other comprehensive income:
Amortization of pension actuarial loss, net of tax	102	102	204	186
Comprehensive income	$ 7,673	$ 9,613	$ 14,043	$ 12,714