CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 27, 2012	Jan. 28, 2011
Cash flows from operating activities:
Net income	$ 49,411	$ 52,511
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,339	30,454
Loss on disposition of property and equipment	1,258	1,693
Share-based compensation	5,946	4,919
Excess tax benefit from share-based compensation	(155)	(2,294)
Changes in assets and liabilities:
Inventories	14,371	13,555
Other current assets	(2,521)	(11,627)
Accounts payable	(6,087)	(27,794)
Accrued employee compensation	3,060	(17,515)
Deferred revenue	22,265	20,929
Other current liabilities	(697)	(12,539)
Other long-term assets and liabilities	(4,231)	5,013
Net cash provided by operating activities	113,959	57,305
Cash flows from investing activities:
Purchase of property and equipment	(38,835)	(40,567)
Proceeds from sale of property and equipment	477	265
Proceeds from insurance recoveries of property and equipment	116	92
Net cash used in investing activities	(38,242)	(40,210)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	92,600	110,700
Principal payments under long-term debt and other long-term obligations	(92,676)	(114,188)
Proceeds from exercise of share-based compensation awards	2,137	20,343
Excess tax benefit from share-based compensation	155	2,294
Purchases and retirement of common stock	0	(10,997)
Dividends on common stock	(10,822)	(9,698)
Net cash used in financing activities	(8,606)	(1,546)
Net increase in cash and cash equivalents	67,111	15,549
Cash and cash equivalents, beginning of period	52,274	47,700
Cash and cash equivalents, end of period	119,385	63,249
Cash paid during the period for:
Interest, net of amounts capitalized	18,916	22,195
Income taxes	6,412	21,639
Supplemental schedule of non-cash financing activity:
Change in fair value of interest rate swaps	6,554	10,654
Change in deferred tax asset for interest rate swaps	$ (192)	$ (1,078)