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Contracts with Customers - Summary of Contract Assets and Contract Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Contract retentions	$ 109.3	$ 89.8
Contract retentions, not expected to be paid in next 12 months	54.1
Contract assets, net claims recovery estimates	$ 58.6	$ 70.7

X

- Definition

Contract receivable retainage asset (liabilities) net, due after one year.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Contract receivable retainage assets (Liabilities) net.

+ References

No definition available.

+ Details

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Namespace Prefix:	psn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of billed or unbilled claims or other similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(c)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- References

No definition available.

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