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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Billions	Sep. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Shares held by ESOP	78,138,602	78,172,809
Shares held by ESOP, redemption values	$ 2.6	$ 1.9

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- Definition

Redeemable equity common stock carrying amount.

+ References

No definition available.

+ Details

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

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- Definition

The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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