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Derivative Instruments and Hedging Activities, Changes in AOCI, Net of Tax, Related to Interest Rate Swaps (Details) (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 02, 2018
Oct. 27, 2017
Changes in AOCI, net of tax, related to interest rate swaps [Roll Forward]    
Balance [1] $ 581,781  
Other comprehensive income before reclassifications 1,293  
Amounts reclassified from AOCI 0  
Other comprehensive income, net of tax 1,293 $ 1,887
Balance 600,178  
Accumulated Other Comprehensive Income [Member]    
Changes in AOCI, net of tax, related to interest rate swaps [Roll Forward]    
Balance 4,685  
Other comprehensive income, net of tax 1,293  
Balance $ 5,978  
[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of August 3, 2018, as filed with the Securities and Exchange Commission in the Company's Annual Report on Form 10-K for the fiscal year ended August 3, 2018.