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Contracts with Customers - Summary of Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Contract assets	$ 790,001	$ 757,515
Contract liabilities	300,799	301,107
Net contract assets (liabilities)	489,202	$ 456,408
Change in contract assets	32,486
Change in contract liabilities	(308)
Change in contract assets and liabilities	$ 32,794
Percentage change in contract assets	4.30%
Percentage change in contract liabilities	(0.10%)
Percentage change in contract assets and liabilities	7.20%

X

- Definition

Change in contract with customer assets.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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- Definition

Change in contract with customer assets and liabilities net.

+ References

No definition available.

+ Details

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- Definition

Change in contract with customer liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	psn_
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Balance Type:	credit
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X

- Definition

Contract with customer asset cumulative catchup adjustment to revenue change in measure of progress percent.

+ References

No definition available.

+ Details

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X

- Definition

Contract with customer asset liability cumulative catchup adjustment to revenue change in measure of progress percent.

+ References

No definition available.

+ Details

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- Definition

Contract with customer asset and liabilities net.

+ References

No definition available.

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X

- Definition

Contract with customer liability cumulative catchup adjustment to revenue change in measure of progress percent.

+ References

No definition available.

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X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

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Period Type:	instant

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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- References

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