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Pension Benefits - Multi-Employer Defined Benefit Pension Plan (Details) $ in Millions	3 Months Ended
	Mar. 29, 2025 USD ($)
Multi-Employer Defined Benefit Pension Plan
Defined benefit plan withdrawal liability payout period	20 years
Defined benefit plan, withdrawal liability, annual installments	$ 0.9
Defined benefit plan, withdrawal liability	$ 12.2

X

- Definition

The expected withdrawal amount of liability under the defined benefit plan.

+ References

No definition available.

+ Details

Name:	bgs_DefinedBenefitPlanExpectedWithdrawalLiabilityAmount
Namespace Prefix:	bgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Defined Benefit Plan Expected Withdrawal Liability Payout Period

+ References

No definition available.

+ Details

Name:	bgs_DefinedBenefitPlanExpectedWithdrawalLiabilityPayoutPeriod
Namespace Prefix:	bgs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined Benefit Plan, Withdrawal Liability, Annual Installments

+ References

No definition available.

+ Details

Name:	bgs_DefinedBenefitPlanWithdrawalLiabilityAnnualInstallments
Namespace Prefix:	bgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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