STOCKHOLDERS’ DEFICIT - Summary of Changes in Equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		4 Months Ended		6 Months Ended
	Apr. 17, 2022	Apr. 11, 2021	Jan. 23, 2022	Jan. 17, 2021	Apr. 17, 2022	Apr. 11, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (786,064)	$ (749,123)	$ (817,882)	$ (793,361)	$ (817,882)	$ (793,361)
Shares issued under stock plans, including tax benefit	2	4,226	49	114
Share-based compensation	2,916	1,605	1,018	1,231
Dividends declared	(9,269)	(9,041)	(9,257)	(9,089)
Fair value of assumed Del Taco RSAs attributable to pre-combination service	449
Purchases of treasury stock		(65,000)
Net earnings	7,796	35,934	39,270	50,859	47,066	86,793
Other comprehensive income	553	842	738	1,123
Ending balance	$ (783,617)	$ (780,557)	$ (786,064)	$ (749,123)	$ (783,617)	$ (780,557)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	82,564	82,394	82,536	82,370	82,536	82,370
Beginning balance	$ 826	$ 824	$ 825	$ 824	$ 825	$ 824
Shares issued under stock plans, including tax benefit (in shares)	5	116	28	24
Shares issued under stock plans, including tax benefit	$ 0	$ 1	$ 1	$ 0
Ending balance (in shares)	82,569	82,510	82,564	82,394	82,569	82,510
Ending balance	$ 826	$ 825	$ 826	$ 824	$ 826	$ 825
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	501,570	490,913	500,441	489,515	500,441	489,515
Shares issued under stock plans, including tax benefit	2	4,225	48	114
Share-based compensation	2,916	1,605	1,018	1,231
Dividends declared	65	55	63	53
Fair value of assumed Del Taco RSAs attributable to pre-combination service	449
Ending balance	505,002	496,798	501,570	490,913	505,002	496,798
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,794,362	1,677,928	1,764,412	1,636,211	1,764,412	1,636,211
Dividends declared	(9,334)	(9,096)	(9,320)	(9,142)
Net earnings	7,796	35,934	39,270	50,859
Ending balance	1,792,824	1,704,766	1,794,362	1,677,928	1,792,824	1,704,766
AOCI Attributable to Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(73,516)	(109,482)	(74,254)	(110,605)	(74,254)	(110,605)
Other comprehensive income	553	842	738	1,123
Ending balance	(72,963)	(108,640)	(73,516)	(109,482)	(72,963)	(108,640)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(3,009,306)	(2,809,306)	(3,009,306)	(2,809,306)	(3,009,306)	(2,809,306)
Purchases of treasury stock		(65,000)
Ending balance	$ (3,009,306)	$ (2,874,306)	$ (3,009,306)	$ (2,809,306)	$ (3,009,306)	$ (2,874,306)