Statement of Operations (Parenthetical)	6 Months Ended
Dec. 31, 2020 shares
Statement of Operations
Excludes aggregate of shares subject to possible redemption	21,215,577

Excludes aggregate of shares subject to possible redemption.

No definition available.

Name:	fgna_ExcludesAggregateOfSharesSubjectToPossibleRedemption
Namespace Prefix:	fgna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration