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Postretirement Benefits (Net Periodic Benefit Costs Assumptions) (Details) (Postretirement Benefits [Member]) | 12 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.57% | 3.78% | 5.29%
Pre Medicare [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health care cost trend rate | 8.00% | 10.00% | 10.00%
Medicare [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health care cost trend rate | 7.00% | 7.00% | 10.00%

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- Definition The beginning-of-the-year estimated health care cost trend rate used in calculating net periodic benefit cost for our postretirement benefit plans. + 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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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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