Business Combinations (Schedule of Proforma Revenue and Net Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				9 Months Ended
	Jun. 30, 2015		Jun. 30, 2014	[1]	Jun. 30, 2015		Jun. 30, 2014	[2]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 14,825	[1]	$ 11,476		$ 39,866	[2]	$ 30,016
Net income (loss)	641	[1]	596		409	[2]	(178)
Net income (loss) attributable to Good Times Restaurants, Inc.	480	[1]	474		131	[2]	(162)
Net income (loss) attributable to common shareholders	$ 480	[1]	$ 474		$ 131	[2]	$ (221)
Basic income (loss) per share	$ 0.04	[1]	$ 0.07		$ 0.01	[2]	$ (0.04)
Diluted income (loss) per share	$ 0.04	[1]	$ 0.06		$ 0.01	[2]	$ (0.04)
Acquisition-related Costs [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss)	$ 365,000				$ 562,000

[1] Net loss during the three months ended June 30, 2015 excludes acquisition related costs of $365,000

[2] Net loss during the nine months ended June 30, 2015 excludes acquisition related costs of $562,000