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Pension Benefits (Narrative) (Details) - Defined Benefit Pension Plans [Member] $ in Millions | 12 Months Ended
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Jun. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Minimum length of investment horizon (in years) | 10 years
Estimated employer contributions to pension plans in next fiscal year - not expected to be material | $ 0.0

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- Definition Minimum number of years in investment horizon for defined benefit pension plan assets in consideration of the average age of the plans' participants. + References No definition available. + Details
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Namespace Prefix: | lanc_
Data Type: | xbrli:durationItemType
Balance Type: | na
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |