Commitments And Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2011
Commitments And Contingencies [Abstract]
Other income - Continued Dumping and Subsidy Offset Act	$ 2,701	$ 961	$ 2,701	$ 961	$ 14,400

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