CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Jul. 31, 2020 USD ($)	Aug. 02, 2019 USD ($)	Aug. 03, 2018 USD ($)
Cash flows from operating activities:
Net income (loss)	$ (32,475)	$ 223,401	$ 247,620
Net loss from unconsolidated subsidiary	142,442	0	0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	118,178	107,537	93,692
Loss on disposition of property and equipment	6,469	10,265	7,119
Gain on sale and leaseback transaction	(69,954)	0	0
Impairment	23,160	0	0
Share-based compensation	6,386	8,181	6,977
Noncash lease expense	63,442	0	0
Changes in assets and liabilities:
Accounts receivable	3,124	(3,261)	(1,380)
Income taxes receivable	(19,403)	(9,449)	4,265
Inventories	16,094	1,295	114
Prepaid expenses and other current assets	401	(1,985)	(500)
Other assets	(5,638)	2,852	(1,400)
Accounts payable	(30,593)	9,889	3,937
Current operating lease liabilities	(11,269)	0	0
Taxes withheld and accrued	(7,019)	1,127	344
Accrued employee compensation	(11,573)	7,311	(10,389)
Accrued employee benefits	(550)	(489)	(1,343)
Deferred revenues	13,028	5,442	3,916
Other current liabilities	6,868	3,492	(8,121)
Long-term operating lease liabilities	(48,854)	0	0
Other long-term obligations	10,673	1,362	157
Deferred income taxes	(11,935)	(4,174)	(14,388)
Net cash provided by operating activities	161,002	362,796	330,620
Cash flows from investing activities:
Purchase of property and equipment	(297,328)	(138,293)	(152,249)
Proceeds from insurance recoveries of property and equipment	1,320	753	616
Proceeds from sale of property and equipment	207,253	151	411
Purchase of investment in unconsolidated subsidiary	0	(89,100)	0
Notes receivable from unconsolidated subsidiary	(35,500)	(15,085)	0
Acquisition of business, net of cash acquired	(32,971)	0	0
Net cash used in investing activities	(157,226)	(241,574)	(151,222)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	801,395	400,000	0
(Taxes withheld) and proceeds from issuance of share-based compensation awards, net	(2,160)	(2,497)	(3,816)
Principal payments under long-term debt	(252,000)	(400,000)	0
Purchases and retirement of common stock	(55,007)	0	(14,772)
Deferred financing costs	(1,348)	(3,022)	0
Dividends on common stock	(94,544)	(193,475)	(207,155)
Net cash provided by (used in) financing activities	396,336	(198,994)	(225,743)
Net increase (decrease) in cash and cash equivalents	400,112	(77,772)	(46,345)
Cash and cash equivalents, beginning of year	36,884	114,656	161,001
Cash and cash equivalents, end of year	436,996	36,884	114,656
Cash paid during the year for:
Interest, net of amounts capitalized	20,268	12,100	17,272
Income taxes	5,666	56,450	43,471
Supplemental schedule of non-cash investing and financing activities:
Capital expenditures accrued in accounts payable	1,691	9,508	8,183
Change in fair value of interest rate swaps	(17,740)	(15,466)	13,103
Change in deferred tax asset for interest rate swaps	4,307	3,868	(4,189)
Dividends declared but not yet paid	$ 32,063	$ 32,859	$ 31,784