Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Treasury Stock	Common Stock [Member]	Capital Contributed in Excess of Par Value [Member]	Non-Controlling Interest In Partnerships [Member]	Accumulated Deficit [Member]	Total
BALANCES at Sep. 23, 2019		$ 13	$ 57,936	$ 1,522	$ (30,551)	$ 28,920
BALANCES, shares at Sep. 23, 2019		12,541,082
Stock-based compensation cost			74			74
Restricted stock unit vesting
Restricted stock unit vesting, shares		76,643
Stock option exercise
Stock option exercise, shares		2,413
Treasury shares purchased	$ (75)					(75)
Treasury shares purchased, shares	43,110	(43,110)
Non-controlling interests:
Income				212		212
Contributions				22		22
Distributions				(291)		(291)
Net Income (Loss) attributable to Good Times Restaurants Inc and comprehensive loss					(811)	(811)
BALANCES at Dec. 29, 2019	$ (75)	$ 13	58,010	1,465	(31,362)	28,051
BALANCES, shares at Dec. 29, 2019	43,110	12,577,028
Stock-based compensation cost			75			75
Restricted stock unit vesting
Restricted stock unit vesting, shares		14,000
Stock option exercise
Stock option exercise, shares						15,646
Non-controlling interests:
Income				174		$ 174
Distributions				(95)		(95)
Net Income (Loss) attributable to Good Times Restaurants Inc and comprehensive loss					(14,916)	(14,916)
BALANCES at Mar. 31, 2020	$ (75)	$ 13	58,085	1,544	(46,278)	13,289
BALANCES, shares at Mar. 31, 2020	43,110	12,591,028
BALANCES at Sep. 29, 2020	$ (75)	$ 13	58,219	1,293	(44,467)	14,983
BALANCES, shares at Sep. 29, 2020	43,110	12,612,852
Stock-based compensation cost			61			61
Restricted stock unit vesting
Restricted stock unit vesting, shares		16,548
Stock option exercise			13			13
Stock option exercise, shares		7,984
Non-controlling interests:
Income				363		363
Distributions				(319)		(319)
Net Income (Loss) attributable to Good Times Restaurants Inc and comprehensive loss					802	802
BALANCES at Dec. 29, 2020	$ (75)	$ 13	58,293	1,337	(43,665)	15,903
BALANCES, shares at Dec. 29, 2020	43,110	12,637,384
BALANCES at Sep. 29, 2020	$ (75)	$ 13	58,219	1,293	(44,467)	$ 14,983
BALANCES, shares at Sep. 29, 2020	43,110	12,612,852
Stock option exercise, shares						43,330
Non-controlling interests:
Income						$ 789
Distributions						(855)
Net Income (Loss) attributable to Good Times Restaurants Inc and comprehensive loss						1,899
BALANCES at Mar. 30, 2021	$ (75)	$ 13	58,591	1,227	(42,568)	17,188
BALANCES, shares at Mar. 30, 2021	43,110	12,695,678
BALANCES at Dec. 29, 2020	$ (75)	$ 13	58,293	1,337	(43,665)	15,903
BALANCES, shares at Dec. 29, 2020	43,110	12,637,384
Stock-based compensation cost			215			215
Common stock granted
Common stock granted, shares		12,948
Performance shares granted
Performance shares granted, shares		10,000
Stock option exercise			83			83
Stock option exercise, shares		35,346
Non-controlling interests:
Income				426		426
Distributions				(536)		(536)
Net Income (Loss) attributable to Good Times Restaurants Inc and comprehensive loss					1,097	1,097
BALANCES at Mar. 30, 2021	$ (75)	$ 13	$ 58,591	$ 1,227	$ (42,568)	$ 17,188
BALANCES, shares at Mar. 30, 2021	43,110	12,695,678