Name:	fgi_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInSharesReservedForIssuanceThresholdNumberOfShares
Namespace Prefix:	fgi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Threshold percentage of annual increase in shares outstanding immediately preceding calendar year in the computation of shares reserved for issuance under the share based payment arrangement plan.

No definition available.

Name:	fgi_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInSharesReservedForIssuanceThresholdPercentage
Namespace Prefix:	fgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Aggregate number of common shares reserved for future issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.