CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total
Balance at Jul. 29, 2016	$ 240	$ 51,462	$ (13,740)	$ 488,481	$ 526,443
Balance (in shares) at Jul. 29, 2016	23,956,134
Comprehensive Income:
Net income	$ 0	0	0	201,899	201,899
Other comprehensive income, net of tax	0	0	9,511	0	9,511
Comprehensive income	0	0	9,511	201,899	211,410
Cash dividends declared	0	0	0	(197,544)	(197,544)
Share-based compensation	0	8,458	0	0	8,458
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 1	(6,897)	0	0	(6,896)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	99,548
Tax benefit realized upon exercise of share-based compensation awards	$ 0	2,636	0	0	2,636
Purchases and retirement of common stock	$ 0	0	0	0	0
Purchases and retirement of common stock (in shares)	0
Balance at Jul. 28, 2017	$ 241	55,659	(4,229)	492,836	544,507
Balance (in shares) at Jul. 28, 2017	24,055,682
Comprehensive Income:
Net income	$ 0	0	0	247,620	247,620
Other comprehensive income, net of tax	0	0	8,914	0	8,914
Comprehensive income	0	0	8,914	247,620	256,534
Cash dividends declared	0	0	0	(207,649)	(207,649)
Share-based compensation	0	6,977	0	0	6,977
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 0	(3,816)	0	0	(3,816)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	55,868
Tax benefit realized upon exercise of share-based compensation awards	$ 0	0	0	0	0
Purchases and retirement of common stock	$ (1)	(14,771)	0	0	(14,772)
Purchases and retirement of common stock (in shares)	(100,000)
Balance at Aug. 03, 2018	$ 240	44,049	4,685	532,807	$ 581,781
Balance (in shares) at Aug. 03, 2018	24,011,550				24,011,550
Comprehensive Income:
Net income	$ 0	0	0	223,401	$ 223,401
Other comprehensive income, net of tax	0	0	(11,598)	0	(11,598)
Comprehensive income	0	0	(11,598)	223,401	211,803
Cash dividends declared	0	0	0	(194,558)	(194,558)
Share-based compensation	0	8,181	0	0	8,181
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 1	(2,498)	0	0	$ (2,497)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	37,690				37,690
Tax benefit realized upon exercise of share-based compensation awards	$ 0	0	0	0	$ 0
Purchases and retirement of common stock	$ 0	0	0	0	0
Purchases and retirement of common stock (in shares)	0
Balance at Aug. 02, 2019	$ 241	$ 49,732	$ (6,913)	$ 561,650	$ 604,710
Balance (in shares) at Aug. 02, 2019	24,049,240				24,049,240