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Acquisition (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2017 USD ($)
Angelic [Member] |
Business Acquisition [Line Items] |
Purchase price | $ 35,487

X
- Definition The purchase price associated with the acquisition of a business during the period, including post-closing adjustments (some of which were not yet paid as of the end of the reporting period), but excluding contingent consideration relating to an additional earn-out payment. + References No definition available. + Details
Name: | lanc_BusinessCombinationConsiderationTransferredPurchasePrice
Namespace Prefix: | lanc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=lanc_AngelicMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |