COMMITMENTS AND CONTINGENCIES - Administrative Services Agreement and Underwriting Agreement (Details) - USD ($)	Sep. 30, 2020	May 29, 2020
COMMITMENTS AND CONTINGENCIES
Deferred fee per unit	$ 0.35
Deferred underwriting fee payable	$ 36,225,000	$ 36,225,000

The carrying value as of balance sheet date of underwriting compensation deferred, classified as noncurrent.

No definition available.

Name:	wpf_DeferredUnderwritingCompensationNoncurrent
Namespace Prefix:	wpf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant