Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
CDSOA receipts	$ 0.3

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