Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Jun. 30, 2016
Accounting Policies [Abstract]
Accrued distribution	$ 6.6	$ 4.5

Carrying value as of the balance sheet date of obligations incurred through that date and payable for various costs associated with shipping products to the customer. These accruals are based on historical information as may be modified by estimates of actual costs incurred. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

No definition available.

Name:	lanc_AccruedDistributionCosts
Namespace Prefix:	lanc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant