XML 73 R58.htm IDEA: XBRL DOCUMENT v3.7.0.1
Accounts Receivable - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 25, 2015
Allowance for Doubtful Accounts Receivable      
Allowance for doubtful accounts at beginning of period $ 1,603 $ 1,216  
Bad debt expense 199 1,252 $ 465
Amounts charged against the allowance (967) (865)  
Allowance for doubtful accounts at end of period $ 835 $ 1,603 $ 1,216