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Summary Of Significant Accounting Policies (Schedule Of Advertising Expense As Percentage Of Net Sales) (Details) | 12 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2010
Summary Of Significant Accounting Policies [Abstract] |  |  |
Advertising expense as a percentage of net sales | 2.00% | 2.00% | 2.00%

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- Definition Advertising Expense As Percentage Of Net Sales + References No definition available. + Details
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Namespace Prefix: | lanc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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