Additional loan issued in percentage

No definition available.

Name:	lnce_AdditionalLoanIssuedInPercentage
Namespace Prefix:	lnce_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Advance contract period for purchase commitment of major ingredients and packaging

+ References

No definition available.

+ Details

Name:	lnce_AdvanceContractPeriodForPurchaseCommitmentOfMajorIngredientsAndPackaging
Namespace Prefix:	lnce_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the loans for which the Company has an obligation as a guarantor.

+ References

No definition available.

+ Details

Name:	lnce_AmountOfLoansGuaranteed
Namespace Prefix:	lnce_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Commitments and contingencies line items

+ References

No definition available.

+ Details

Name:	lnce_CommitmentsAndContingenciesLineItems
Namespace Prefix:	lnce_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Contract Period For Walnuts

+ References

No definition available.

+ Details

Name:	lnce_ContractPeriodForWalnuts
Namespace Prefix:	lnce_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Guarantee of future payments

+ References

No definition available.

+ Details

Name:	lnce_GuaranteeOfFuturePayments
Namespace Prefix:	lnce_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Annual commitment on contract to receive services from syndicated market data provider

+ References

No definition available.

+ Details

Name:	lnce_ServiceContractAnnualCommitmentwithSyndicatedMarketDataProvider
Namespace Prefix:	lnce_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(19))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(17))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationCaseAxis=lnce_IBOLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationCaseAxis=lnce_CaliforniaLaborCodeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 01, 2017	Jun. 26, 2017	Dec. 31, 2016	Sep. 19, 2016
Commitments And Contingencies [Line Items]
Purchase commitments for inventory	$ 208.7		$ 157.2
Other commitment	12.9
Letters of credit	12.4		12.6
Financial Guarantee
Commitments And Contingencies [Line Items]
Outstanding aggregate balance on loans	$ 157.9		$ 154.1
Percentage of outstanding loans under the guarantee	25.00%
Percentage of new loans issued	25.00%
Minimum
Commitments And Contingencies [Line Items]
Advance contract period for purchase commitment of major ingredients and packaging (months)	3 months
Contract period for walnuts	1 year
Service contract annual commitment with syndicated market data provider	$ 4.6
Maximum
Commitments And Contingencies [Line Items]
Advance contract period for purchase commitment of major ingredients and packaging (months)	12 months
Contract period for walnuts	3 years
Service contract annual commitment with syndicated market data provider	$ 5.3
Pending Litigation \| IBO Litigation \| Accounts Payable and Accrued Liabilities
Commitments And Contingencies [Line Items]
Loss contingency accrual		$ 1.5
Pending Litigation \| California Labor Code \| Accounts Payable and Accrued Liabilities
Commitments And Contingencies [Line Items]
Loss contingency accrual				$ 0.7