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Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2010
Commitments And Contingencies [Abstract] |  |  |
Percentage of employees represented under collective bargaining agreements | 19.00% |  |
CDSOA receipts | $ 2,701 | $ 14,388 | $ 893

X
- Definition The aggregate amount of other income resulting from distributions received under the Continued Dumping and Subsidy Offset Act of 2000. + References No definition available. + Details
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Namespace Prefix: | lanc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage Of Employees Represented Under Collective Bargaining Agreements + References No definition available. + Details
Name: | lanc_PercentageOfEmployeesRepresentedUnderCollectiveBargainingAgreements
Namespace Prefix: | lanc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration