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Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Statement of Cash Flows [Abstract] |  |  |
Special dividend payment | $ 0 | $ 0 | $ 136,677

X
- Definition Amount of cash outflow in the form of special dividends to common shareholders of the parent entity. + References No definition available. + Details
Name: | lanc_PaymentOfSpecialDividendsCommonStock
Namespace Prefix: | lanc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration