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Leases (Schedule of Supplemental Cash Flow Information Related to Leases) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2021 | Sep. 29, 2020
Lessee Disclosure [Abstract] |  |
Cash paid for operating lease liabilities | $ 7,028 | $ 6,840
Non-cash operating lease assets obtained in exchange for operating lease liabilities | $ 324 | $ 2,390

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- Definition Amount of cash outflow for operating lease liabilities. + References No definition available. + Details
Name: | gtim_OperatingLeaseLiabilitiesPayments
Namespace Prefix: | gtim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LesseeDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
Name: | us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration