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New Accounting Pronouncements (Details) $ in Millions	Jun. 30, 2019 USD ($)
New Accounting Pronouncement [Abstract]
ROU Asset Adoption	$ 93.0

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- Definition

New Accounting Pronouncement [Abstract]

+ References

No definition available.

+ Details

Name:	bgg_NewAccountingPronouncementAbstract
Namespace Prefix:	bgg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

ROU Asset Adoption

+ References

No definition available.

+ Details

Name:	bgg_ROUAssetAdoption
Namespace Prefix:	bgg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant