XML 99 R116.htm IDEA: XBRL DOCUMENT v3.20.1

Quarterly Information - Unaudited - Schedule of Selected Quarterly Financial Information (Parenthetical) (Details) - Critical Infrastructure $ in Millions	3 Months Ended
	Jun. 29, 2018 USD ($)
Quarterly Financial Information [Line Items]
Increase in revenue	$ 55.1
Increase in other income	$ 74.6

X

- Definition

Increase in other income.

+ References

No definition available.

+ Details

Name:	psn_IncreaseInOtherIncome
Namespace Prefix:	psn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase in revenue.

+ References

No definition available.

+ Details

Name:	psn_IncreaseInRevenue
Namespace Prefix:	psn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Quarterly financial information.

+ References

No definition available.

+ Details

Name:	psn_QuarterlyFinancialInformationLineItems
Namespace Prefix:	psn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=psn_CriticalInfrastructureSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: