Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_BusinessAcquisitionAxis=lanc_AngelicMember
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Fair Value (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
Fair Value (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Oct. 19, 2018	Jun. 30, 2018	Nov. 17, 2016
Business Acquisition [Line Items]
Fair value of contingent consideration	$ 15,563			$ 15,563			$ 17,080
Decrease (increase) in the fair value of contingent consideration	(88)		$ (521)	9,517	$ (1,514)
Bantam Bagels [Member]
Business Acquisition [Line Items]
Fair value of contingent consideration	8,183			8,183		$ 8,000	0
Decrease (increase) in the fair value of contingent consideration	(88)		0	(183)	0
Angelic [Member]
Business Acquisition [Line Items]
Fair value of contingent consideration	7,380			7,380			$ 17,080	$ 13,900
Decrease (increase) in the fair value of contingent consideration	$ 0	$ 9,700	$ (521)	$ 9,700	$ (1,514)