Acquisition (Narrative) (Details) $ in Millions	12 Months Ended
Jun. 30, 2017 USD ($)
Angelic [Member]
Business Acquisition [Line Items]
Purchase price	$ 35.5

The purchase price associated with the acquisition of a business during the period, including post-closing adjustments (some of which were not yet paid as of the end of the reporting period), but excluding contingent consideration relating to an additional earn-out payment.

No definition available.

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