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. 25, 2018		$ 12	$ 59,385	$ 3,238	$ (25,414)	$ 37,221
BALANCES, shares at Sep. 25, 2018		12,481,162
Stock-based compensation cost			112			112
Restricted stock unit vesting		$ 1				1
Restricted stock grant vesting, shares		40,949
Stock option exercise			3			3
Stock option exercise, shares		667
Non-controlling interests:
Income				309		309
Distributions				(478)		(478)
Net loss attributable to Good Times Restaurants Inc and comprehensive loss					(1,051)	(1,051)
BALANCES at Dec. 25, 2018		$ 13	59,500	3,069	(26,465)	36,117
BALANCES, shares at Dec. 25, 2018		12,522,778
BALANCES at Sep. 25, 2018		$ 12	59,385	3,238	(25,414)	$ 37,221
BALANCES, shares at Sep. 25, 2018		12,481,162
Stock option exercise, shares						667
BALANCES at Mar. 26, 2019		$ 13	57,438	2,143	(26,915)	$ 32,679
BALANCES, shares at Mar. 26, 2019		12,522,778
BALANCES at Dec. 25, 2018		$ 13	59,500	3,069	(26,465)	36,117
BALANCES, shares at Dec. 25, 2018		12,522,778
Stock-based compensation cost			109			109
Non-controlling interests:
Income				270		270
Distributions				(408)		(408)
Purchase of non-controlling interest			(2,171)	(788)		(2,959)
Net loss attributable to Good Times Restaurants Inc and comprehensive loss					(450)	(450)
BALANCES at Mar. 26, 2019		$ 13	57,438	2,143	(26,915)	32,679
BALANCES, shares at Mar. 26, 2019		12,522,778
BALANCES at Sep. 24, 2019		$ 13	57,936	1,522	(30,551)	28,920
BALANCES, shares at Sep. 24, 2019		12,541,082
Stock-based compensation cost			74			74
Restricted stock unit vesting
Restricted stock grant vesting, shares		76,643
Stock option exercise
Stock option exercise, shares		2,413
Non-controlling interests:
Treasury shares purchased	$ (75)					(75)
Treasury shares purchased, shares	43,110	(43,110)
Income				212		212
Contributions				22		22
Distributions				(291)		(291)
Net loss attributable to Good Times Restaurants Inc and comprehensive loss					(811)	(811)
BALANCES at Dec. 31, 2019	$ (75)	$ 13	58,010	1,465	(31,362)	28,051
BALANCES, shares at Dec. 31, 2019	43,110	12,577,028
BALANCES at Sep. 24, 2019		$ 13	57,936	1,522	(30,551)	$ 28,920
BALANCES, shares at Sep. 24, 2019		12,541,082
Stock option exercise, shares						15,646
Non-controlling interests:
Income						$ 386
Contributions						22
Distributions						(386)
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 Dec. 31, 2019	$ (75)	$ 13	58,010	1,465	(31,362)	28,051
BALANCES, shares at Dec. 31, 2019	43,110	12,577,028
Stock-based compensation cost			75			75
Restricted stock unit vesting
Restricted stock grant vesting, shares		14,000
Stock option exercise
Stock option exercise, shares						15,646
Non-controlling interests:
Income				174		$ 174
Contributions
Distributions				(95)		(95)
Net 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