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 of Change in Accounting Principle, Net of Taxes [Member] Common Stock [Member]	Cumulative-Effect of Change in Accounting Principle, Net of Taxes [Member] Additional Paid-In Capital [Member]	Cumulative-Effect of Change in Accounting Principle, Net of Taxes [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative-Effect of Change in Accounting Principle, Net of Taxes [Member] Retained Earnings [Member]	Cumulative-Effect of Change in Accounting Principle, Net of Taxes [Member]
Balances at Jul. 31, 2020	$ 237	$ 0	$ (20,346)	$ 438,498	$ 418,389
Balances (in shares) at Jul. 31, 2020	23,697,396
Comprehensive Income:
Net income	$ 0	0	0	254,513	254,513
Other comprehensive income, net of tax	0	0	20,346	0	20,346
Comprehensive income	0	0	20,346	254,513	274,859
Cash dividends declared	0	0	0	(23,766)	(23,766)
Share-based compensation	0	8,729	0	0	8,729
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 0	(2,282)	0	0	(2,282)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	32,313
Purchases and retirement of common stock	$ (2)	(29,151)	0	(5,847)	(35,000)
Purchases and retirement of common stock (in shares)	(232,543)
Equity component value of convertible note issuance, net of tax	$ 0	53,004	0	0	53,004
Sale of common stock warrant	0	31,710	0	0	31,710
Purchase of convertible note hedge	0	(62,010)	0	0	(62,010)
Balances at Jul. 30, 2021	$ 235	0	0	663,398	663,633
Balances (in shares) at Jul. 30, 2021	23,497,166
Comprehensive Income:
Net income	$ 0	0	0	131,880	131,880
Other comprehensive income, net of tax	0	0	0	0	0
Comprehensive income	0	0	0	131,880	131,880
Cash dividends declared	0	0	0	(121,135)	(121,135)
Share-based compensation	0	8,198	0	0	8,198
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 0	(2,599)	0	0	(2,599)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	32,461
Purchases and retirement of common stock	$ (12)	(5,599)	0	(125,931)	(131,542)
Purchases and retirement of common stock (in shares)	(1,248,184)
Balances at Jul. 29, 2022	$ 223	0	0	511,256	$ 511,479	$ 0	$ 0	$ 0	$ (36,956)	$ (36,956)
Balances (in shares) at Jul. 29, 2022	22,281,443				22,281,443
Comprehensive Income:
Net income	$ 0	0	0	99,050	$ 99,050
Other comprehensive income, net of tax	0	0	0	0	0
Comprehensive income	0	0	0	99,050	99,050
Cash dividends declared	0	0	0	(115,852)	(115,852)
Share-based compensation	0	9,045	0	0	9,045
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 0	(2,448)	0	0	$ (2,448)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	43,974				43,974
Purchases and retirement of common stock	$ (2)	(2,711)	0	(14,736)	$ (17,449)
Purchases and retirement of common stock (in shares)	(171,792)
Balances at Jul. 28, 2023	$ 221	$ 3,886	$ 0	$ 479,718	$ 483,825
Balances (in shares) at Jul. 28, 2023	22,153,625				22,153,625