CONDENSED 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		Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-In Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]
Balances at Aug. 02, 2019	$ 241	$ 49,732	$ (6,913)	$ 561,650	$ 604,710
Balances (in shares) at Aug. 02, 2019	24,049,240
Comprehensive Income (Loss):
Net income	$ 0	0	0	43,223	43,223
Other comprehensive income (loss), net of tax	0	0	(438)	0	(438)
Comprehensive income (loss)	0	0	(438)	43,223	42,785
Cash dividends declared	0	0	0	(31,452)	(31,452)
Share-based compensation	0	1,798	0	0	1,798
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 0	(1,994)	0	0	(1,994)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	18,466
Purchases and retirement of common stock	$ (1)	(14,187)	0	0	(14,188)
Purchases and retirement of common stock (in shares)	(91,748)
Balances at Nov. 01, 2019	$ 240	35,349	(7,351)	577,546	605,784
Balances (Adjustments for New Accounting Pronouncement [Member]) at Nov. 01, 2019							$ 0	$ 0	$ 0	$ 4,125	$ 4,125
Balances (in shares) at Nov. 01, 2019	23,975,958
Balances at Aug. 02, 2019	$ 241	49,732	(6,913)	561,650	604,710
Balances (in shares) at Aug. 02, 2019	24,049,240
Comprehensive Income (Loss):
Net income					104,391
Other comprehensive income (loss), net of tax					(2,487)
Comprehensive income (loss)					101,904
Balances at Jan. 31, 2020	$ 240	31,659	(9,400)	607,431	629,930
Balances (in shares) at Jan. 31, 2020	23,943,248
Balances at Nov. 01, 2019	$ 240	35,349	(7,351)	577,546	605,784
Balances (in shares) at Nov. 01, 2019	23,975,958
Comprehensive Income (Loss):
Net income	$ 0	0	0	61,168	61,168
Other comprehensive income (loss), net of tax	0	0	(2,049)	0	(2,049)
Comprehensive income (loss)	0	0	(2,049)	61,168	59,119
Cash dividends declared	0	0	0	(31,283)	(31,283)
Share-based compensation	0	2,122	0	0	2,122
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 0	0	0	0	0
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	4,867
Purchases and retirement of common stock	$ 0	(5,812)	0	0	(5,812)
Purchases and retirement of common stock (in shares)	(37,577)
Balances at Jan. 31, 2020	$ 240	31,659	(9,400)	607,431	629,930
Balances (in shares) at Jan. 31, 2020	23,943,248
Balances at Jul. 31, 2020	$ 237	0	(20,346)	438,498	$ 418,389	[1]
Balances (in shares) at Jul. 31, 2020	23,697,396				23,697,396
Comprehensive Income (Loss):
Net income	$ 0	0	0	170,680	$ 170,680
Other comprehensive income (loss), net of tax	0	0	2,601	0	2,601
Comprehensive income (loss)	0	0	2,601	170,680	173,281
Cash dividends declared	0	0	0	(40)	(40)
Share-based compensation	0	1,974	0	0	1,974
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 0	(1,974)	0	(18)	(1,992)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	22,928
Balances at Oct. 30, 2020	$ 237	0	(17,745)	609,120	591,612
Balances (in shares) at Oct. 30, 2020	23,720,324
Balances at Jul. 31, 2020	$ 237	0	(20,346)	438,498	$ 418,389	[1]
Balances (in shares) at Jul. 31, 2020	23,697,396				23,697,396
Comprehensive Income (Loss):
Net income					$ 184,680
Other comprehensive income (loss), net of tax					3,667
Comprehensive income (loss)					188,347
Balances at Jan. 29, 2021	$ 237	1,967	(16,679)	623,086	$ 608,611
Balances (in shares) at Jan. 29, 2021	23,724,412				23,724,412
Balances at Oct. 30, 2020	$ 237	0	(17,745)	609,120	$ 591,612
Balances (in shares) at Oct. 30, 2020	23,720,324
Comprehensive Income (Loss):
Net income	$ 0	0	0	14,000	14,000
Other comprehensive income (loss), net of tax	0	0	1,066	0	1,066
Comprehensive income (loss)	0	0	1,066	14,000	15,066
Cash dividends declared	0	0	0	(52)	(52)
Share-based compensation	0	1,992	0	0	1,992
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 0	(25)	0	18	(7)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	4,088
Balances at Jan. 29, 2021	$ 237	$ 1,967	$ (16,679)	$ 623,086	$ 608,611
Balances (in shares) at Jan. 29, 2021	23,724,412				23,724,412

[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.