Shareholders' Equity, Summary of Changes in AOCL, Net of Tax (Details) - USD ($) $ in Thousands		3 Months Ended
		Oct. 28, 2016	Oct. 30, 2015
Changes in AOCL, net of tax, related to interest rate swaps [Roll Forward]
Balance, beginning of period	[1]	$ 526,443
Other comprehensive income before reclassifications		4,539
Amounts reclassified from AOCL		(768)
Other comprehensive income (loss), net of tax		3,771	$ (3,033)
Balance, end of period		547,105
Accumulated Other Comprehensive Loss [Member]
Changes in AOCL, net of tax, related to interest rate swaps [Roll Forward]
Balance, beginning of period		(13,740)
Balance, end of period		$ (9,969)

[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of July 29, 2016, as filed with the Securities and Exchange Commission in the Company's Annual Report on Form 10-K for the fiscal year ended July 29, 2016.