CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Jul. 25, 2020	Jul. 27, 2019
Statement of Stockholders' Equity [Abstract]
Tax expense (benefit) associated with other comprehensive loss and income	$ (196)	$ (69)
Tax expense for adjustment due to the adoption of ASU 2016-02		$ 1,385
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201602Member