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Contingencies - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2022 Claim
Commitments And Contingencies Disclosure [Abstract] |
Number of claims outstanding | 0

X
- Definition Loss contingency, number of claims. + References No definition available. + Details
Name: | psn_LossContingencyNumberOfClaims
Namespace Prefix: | psn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration