CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total
Balance at Aug. 03, 2012	$ 234	$ 28,676	$ (21,158)	$ 374,923	$ 382,675
Balance (in shares) at Aug. 03, 2012	23,473,024
Comprehensive Income:
Net income	$ 0	0	0	117,265	117,265
Other comprehensive income, net of tax	0	0	14,546	0	14,546
Comprehensive income	0	0	14,546	117,265	131,811
Cash dividends declared	0	0	0	(53,515)	(53,515)
Share-based compensation	0	17,839	0	0	17,839
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 4	6,450	0	0	6,454
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	366,603
Tax benefit realized upon exercise of share-based compensation awards	$ 0	2,332	0	0	2,332
Purchases and retirement of common stock	$ (1)	(3,569)	0	0	(3,570)
Purchases and retirement of common stock (in shares)	(44,300)
Balance at Aug. 02, 2013	$ 237	51,728	(6,612)	438,673	484,026
Balance (in shares) at Aug. 02, 2013	23,795,327
Comprehensive Income:
Net income	$ 0	0	0	132,128	132,128
Other comprehensive income, net of tax	0	0	1,879	0	1,879
Comprehensive income	0	0	1,879	132,128	134,007
Cash dividends declared	0	0	0	(77,634)	(77,634)
Share-based compensation	0	7,924	0	0	7,924
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 2	(8,459)	0	0	(8,457)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	145,900
Tax benefit realized upon exercise of share-based compensation awards	$ 0	1,248	0	0	1,248
Purchases and retirement of common stock	$ (1)	(12,472)	0	0	(12,473)
Purchases and retirement of common stock (in shares)	(120,000)
Balance at Aug. 01, 2014	$ 238	39,969	(4,733)	493,167	$ 528,641
Balance (in shares) at Aug. 01, 2014	23,821,227				23,821,227
Comprehensive Income:
Net income	$ 0	0	0	163,903	$ 163,903
Other comprehensive income, net of tax	0	0	1,008	0	1,008
Comprehensive income	0	0	1,008	163,903	164,911
Cash dividends declared	0	0	0	(171,383)	(171,383)
Share-based compensation	0	16,210	0	0	16,210
Issuance of share-based compensation awards, net of shares withheld for employee taxes	$ 2	(4,818)	0	0	$ (4,816)
Issuance of share-based compensation awards, net of shares withheld for employee taxes (in shares)	154,528				154,528
Tax benefit realized upon exercise of share-based compensation awards	$ 0	4,705	0	0	$ 4,705
Purchases and retirement of common stock	$ 0	0	0	0	0
Purchases and retirement of common stock (in shares)	0
Balance at Jul. 31, 2015	$ 240	$ 56,066	$ (3,725)	$ 485,687	$ 538,268
Balance (in shares) at Jul. 31, 2015	23,975,755				23,975,755