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Earnings Per Share - Schedule of Repurchase Program (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Total shares repurchased	95,413	245,000	522,501	245,000
Total shares retired	95,413	245,000	522,501	245,000
Average price paid per share	$ 41.42	$ 35.51	$ 37.32	$ 35.51

X

- Definition

Stock repurchase average price paid per share.

+ References

No definition available.

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Namespace Prefix:	psn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

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X

- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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X

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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