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Unrecognized Tax Benefits (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 29, 2015
Mar. 29, 2015
Income Tax Contingency [Line Items]    
Unrecognized Tax Benefits, Period Increase (Decrease) $ 4,200us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease $ 2,100us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Unrecognized Tax Benefits, Period Increase (Decrease), Current Effective Tax Rate Impact [Member]    
Income Tax Contingency [Line Items]    
Unrecognized Tax Benefits, Period Increase (Decrease) $ 4,200us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_IncomeTaxAuthorityAxis
= bgg_UnrecognizedTaxBenefitsPeriodIncreaseCurrentEffectiveTaxRateImpactMember
$ 2,100us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_IncomeTaxAuthorityAxis
= bgg_UnrecognizedTaxBenefitsPeriodIncreaseCurrentEffectiveTaxRateImpactMember