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Fair Value of Financial Instruments - Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Parenthetical) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Long-Term Credit Facility
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Cost	$ 85,619	$ 168,830	$ 219,400

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- Definition

Fair value measurement with unobservable inputs reconciliations recurring basis liability value at cost.

+ References

No definition available.

+ Details

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Namespace Prefix:	pflt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_LineOfCreditFacilityAxis=pflt_LongTermCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: