Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Commitments And Contingencies [Abstract]
Percentage of employees represented under collective bargaining agreements	19.00%
CDSOA receipts	$ 2,701	$ 14,388	$ 893

The aggregate amount of other income resulting from distributions received under the Continued Dumping and Subsidy Offset Act of 2000.

No definition available.

Name:	lanc_OtherIncomeContinuedDumpingAndSubsidyOffsetAct
Namespace Prefix:	lanc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration