XML 45 R35.htm IDEA: XBRL DOCUMENT v3.7.0.1
Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 09, 2015
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Jan. 31, 2015
Operating Leases            
Rent expense   $ 11,993 $ 10,885 $ 23,593 $ 21,535  
Loss contingency trial start date       Mar. 02, 2015    
Loss contingency trial end date       Mar. 06, 2015    
Trial award against defendants to the action $ 11,887          
Accrued amount of litigation           $ 4,000