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Pension and Postretirement Benefits Pension and Postretirement Benefits (Narrative) (Details) (USD $)
 6 Months Ended
Dec. 28, 2014
Defined Benefit Plan Disclosure [Line Items]  
Cash Contributions to Qualified Pension Plans $ 0us-gaap_PensionContributions
Non-Qualified Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 3,200,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= bgg_NonQualifiedPensionPlansMember
Defined Benefit Plan, Benefits Paid 1,300,000us-gaap_DefinedBenefitPlanBenefitsPaid
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= bgg_NonQualifiedPensionPlansMember
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 12,700,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Other Postretirement Benefits Payments 8,300,000us-gaap_OtherPostretirementBenefitsPayments
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Pension Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year $ 0us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember