Derivative Instruments and Hedging Activities, Changes in AOCL, Net of Tax, Related to Interest Rate Swaps (Details) - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Apr. 30, 2021	Jan. 29, 2021	Oct. 30, 2020		May 01, 2020	Jan. 31, 2020	Nov. 01, 2019	Apr. 30, 2021		May 01, 2020
Changes in AOCL, net of tax, related to interest rate swaps [Roll Forward]
Balances	$ 608,611	$ 591,612	$ 418,389	[1]	$ 629,930	$ 605,784	$ 604,710	$ 418,389	[1]	$ 604,710
Other comprehensive income before reclassifications								11,262
Amounts reclassified from AOCL								(4,637)
Other comprehensive income (loss), net of tax	2,958	1,066	2,601		(10,054)	(2,049)	(438)	6,625		(12,541)
Balances	648,113	608,611	591,612		392,209	629,930	605,784	648,113		392,209
Accumulated Other Comprehensive Loss [Member]
Changes in AOCL, net of tax, related to interest rate swaps [Roll Forward]
Balances	(16,679)	(17,745)	(20,346)		(9,400)	(7,351)	(6,913)	(20,346)		(6,913)
Other comprehensive income (loss), net of tax	2,958	1,066	2,601		(10,054)	(2,049)	(438)
Balances	$ (13,721)	$ (16,679)	$ (17,745)		$ (19,454)	$ (9,400)	$ (7,351)	$ (13,721)		$ (19,454)

[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of July 31, 2020, as filed with the Securities and Exchange Commission in the Company’s Annual Report on Form 10-K for the fiscal year ended July 31, 2020.