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

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- Definition Increase in other income. + References No definition available. + Details
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Namespace Prefix: | psn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase in revenue. + References No definition available. + Details
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Namespace Prefix: | psn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Quarterly financial information. + References No definition available. + Details
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Namespace Prefix: | psn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |