Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Statement of Cash Flows [Abstract]
Special dividend payment	$ 0	$ 136,677	$ 0

Amount of cash outflow in the form of special dividends to common shareholders of the parent entity.

No definition available.

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