Derivative Instruments and Hedging Activities, Changes in AOCL, Net of Tax, Related to Interest Rate Swaps (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended
	Jan. 31, 2020	Nov. 01, 2019		Feb. 01, 2019	Nov. 02, 2018	Jan. 31, 2020		Feb. 01, 2019
Changes in AOCL, net of tax, related to interest rate swaps [Roll Forward]
Balance	$ 605,784	$ 604,710	[1]	$ 600,178	$ 581,781	$ 604,710	[1]	$ 581,781
Other comprehensive loss before reclassifications						(2,417)
Amounts reclassified from AOCL						(70)
Other comprehensive loss, net of tax	(2,049)	(438)		(4,039)	1,293	(2,487)		(2,746)
Balance	629,930	605,784		628,618	600,178	629,930		628,618
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in AOCL, net of tax, related to interest rate swaps [Roll Forward]
Balance	(7,351)	(6,913)		5,978	4,685	(6,913)		4,685
Other comprehensive loss, net of tax	(2,049)	(438)		(4,039)	1,293
Balance	$ (9,400)	$ (7,351)		$ 1,939	$ 5,978	$ (9,400)		$ 1,939

[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of August 2, 2019, as filed with the Securities and Exchange Commission in the Company’s Annual Report on Form 10-K for the fiscal year ended August 2, 2019.