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Legal Proceedings - Additional Information (Detail) | 2 Months Ended
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Oct. 31, 2010
Legal Proceedings [Line Items] |
Number of lawsuits filed by the plaintiffs | 5
Number of other U.S. and Canadian containerboard producers | PCA and eight other U.S. and Canadian containerboard producers were named as defendants

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- Details
Name: | pkg_LegalProceedingsLineItems
Namespace Prefix: | pkg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of claims outstanding at the end of the accounting period. + References No definition available. + Details
Name: | pkg_LossContingencyNumberOfClaims
Namespace Prefix: | pkg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Identifies individuals or entities that are co-defendants in a lawsuit, and who may have to pay all or a portion of any damages awarded. + References No definition available. + Details
Name: | us-gaap_LossContingencyPartiesJointlyAndSeverallyLiableInLitigation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration