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Summary of Significant Accounting Policies - Segment Information (Details) - segment | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Sep. 30, 2016 | Sep. 01, 2015
Segment Information |  |  |
Number of reportable segments | 3 | 3 |
Kansas Entertainment |  |  |
Segment Information |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00%
Penn Interactive Ventures |  |  |
Segment Information |  |  |
Percentage of net revenues |  | 0.50% |
Percentage of income from operations |  | 0.40% |

X
- Definition Represents the percentage of income from operations derived from the division. + References No definition available. + Details
Name: | penn_IncomeFromOperationsPercentage
Namespace Prefix: | penn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the entity's ownership interest in a joint venture. + References No definition available. + Details
Name: | penn_JointVentureOwnershipInterestPercentage
Namespace Prefix: | penn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of net revenue derived from the division. + References No definition available. + Details
Name: | penn_NetRevenuePercentage
Namespace Prefix: | penn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis=penn_KansasEntertainmentLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=penn_PennInteractiveVenturesLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |