STOCKHOLDERS’ DEFICIT - Summary of Changes in Equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				4 Months Ended		9 Months Ended
	Jul. 09, 2023	Apr. 16, 2023	Jul. 10, 2022	Apr. 17, 2022	Jan. 22, 2023	Jan. 23, 2022	Jul. 09, 2023	Jul. 10, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (701,443)	$ (703,068)	$ (783,617)	$ (786,064)	$ (736,192)	$ (817,882)	$ (736,192)	$ (817,882)
Shares issued under stock plans, including tax benefit	263	0	0	2	0	49
Share-based compensation	2,059	2,398	1,607	2,916	3,534	1,018
Dividends declared	(8,978)	(9,066)	(9,264)	(9,269)	(9,154)	(9,257)
Fair value of assumed Del Taco RSAs attributable to pre-combination service				449
Purchases of treasury stock	(26,852)	(18,580)			(14,999)		(60,400)
Net earnings	29,168	26,507	22,857	7,796	53,254	39,270	108,929	69,923
Other comprehensive income	366	366	553	553	489	738	1,221	1,844
Ending balance	$ (705,417)	$ (701,443)	$ (767,864)	$ (783,617)	$ (703,068)	$ (786,064)	$ (705,417)	$ (767,864)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	82,629	82,617	82,569	82,564	82,581	82,536	82,581	82,536
Beginning balance	$ 826	$ 826	$ 826	$ 826	$ 826	$ 825	$ 826	$ 825
Shares issued under stock plans, including tax benefit (in shares)	17	12	11	5	36	28
Shares issued under stock plans, including tax benefit	$ 0	$ 0	$ 0	$ 0	$ 0	$ 1
Ending balance (in shares)	82,646	82,629	82,580	82,569	82,617	82,564	82,646	82,580
Ending balance	$ 826	$ 826	$ 826	$ 826	$ 826	$ 826	$ 826	$ 826
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	514,395	511,924	505,002	501,570	508,323	500,441	508,323	500,441
Shares issued under stock plans, including tax benefit	263	0	0	2	0	48
Share-based compensation	2,059	2,398	1,607	2,916	3,534	1,018
Dividends declared	72	73	65	65	67	63
Fair value of assumed Del Taco RSAs attributable to pre-combination service				449
Ending balance	516,789	514,395	506,674	505,002	511,924	501,570	516,789	506,674
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,904,348	1,886,980	1,792,824	1,794,362	1,842,947	1,764,412	1,842,947	1,764,412
Dividends declared	(9,050)	(9,139)	(9,329)	(9,334)	(9,221)	(9,320)
Net earnings	29,168	26,507	22,857	7,796	53,254	39,270
Ending balance	1,924,466	1,904,348	1,806,352	1,792,824	1,886,980	1,794,362	1,924,466	1,806,352
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(53,127)	(53,493)	(72,963)	(73,516)	(53,982)	(74,254)	(53,982)	(74,254)
Other comprehensive income	366	366	553	553	489	738
Ending balance	(52,761)	(53,127)	(72,410)	(72,963)	(53,493)	(73,516)	(52,761)	(72,410)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(3,067,885)	(3,049,305)	(3,009,306)	(3,009,306)	(3,034,306)	(3,009,306)	(3,034,306)	(3,009,306)
Purchases of treasury stock	(26,852)	(18,580)			(14,999)
Ending balance	$ (3,094,737)	$ (3,067,885)	$ (3,009,306)	$ (3,009,306)	$ (3,049,305)	$ (3,009,306)	$ (3,094,737)	$ (3,009,306)