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Organization (Details) - item	Nov. 01, 2018	Oct. 31, 2018
Organization
Number of classes of common stock	1	2

X

- Definition

Represents the number of classes of common stock.

+ References

No definition available.

+ Details

Name:	pfsi_NumberOfClassesOfCommonStock
Namespace Prefix:	pfsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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