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Long-Term Debt Schedule of maturities (Details) $ in Millions | Jun. 20, 2019 USD ($)
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Notes Payable to Banks |
Debt Instrument [Line Items] |
Long-term Debt, Excluding Unamortized Cost of Debt Extinguishment Costs | $ 50

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- Definition Long-term Debt, Excluding Unamortized Cost of Debt Extinguishment Costs + References No definition available. + Details
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Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |