SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Condensed balance sheet are reconciled (Details) - USD ($)		8 Months Ended	9 Months Ended	12 Months Ended
Jun. 19, 2020	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Proceeds allocated to Public Warrants	$ (12,350,000)	$ (12,350,000)
Class A ordinary shares subject to possible redemption			$ 517,500,000	$ 517,500,000
Class A Common Stock Subject to Redemption
Class A ordinary shares subject to possible redemption				517,500,000
Class A ordinary shares
Gross proceeds			517,500,000	517,500,000
Proceeds allocated to Public Warrants			(24,150,000)	(24,150,000)
Class A ordinary shares issuance costs			(28,115,576)	(28,115,576)
Accretion of carrying value to redemption value			52,265,576	52,265,576
Class A ordinary shares subject to possible redemption			$ 517,500,000	$ 517,500,000

Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

No definition available.

Name:	us-gaap_TemporaryEquityCarryingAmountAttributableToParent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant