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Defined Contribution And Other Employee Plans (Schedule Of Costs Related To Company-Sponsored Defined Contribution Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Company-Sponsored Plans [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Costs related to company-sponsored defined contribution plans | $ 5,015 | $ 4,170 | $ 2,637

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=lanc_CompanySponsoredPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |