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Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Contract with Customer, Asset and Liability (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Contract with customer, asset, revenue recognized in excess of amounts billed, current | $ 3.8 |  | $ 3.8 |  | $ 3.6
Contract with customer, liability, revenue recognized | 1.1 | $ 0.6 | 6.2 | $ 2.7 |
Contract with customer, liability, accrued contract losses, current | $ 0.4 |  | $ 0.4 |  | $ 1.6

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- Definition Contract with customer, asset, revenue recognized in excess of amounts billed, current. + References No definition available. + Details
Name: | gifi_ContractWithCustomerAssetRevenueRecognizedInExcessOfAmountsBilledCurrent
Namespace Prefix: | gifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract with customer liability accrued contract losses current. + References No definition available. + Details
Name: | gifi_ContractWithCustomerLiabilityAccruedContractLossesCurrent
Namespace Prefix: | gifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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