Name:	gnrc_ExtendedProductWarrantyAccrualDueAfterYearFive
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of deferred revenue related to extended product warranty to be recognized in the remainder of the fiscal year following the latest fiscal year.

No definition available.

Name:	gnrc_ExtendedProductWarrantyAccrualDueInRemainderOfFiscalYear
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of deferred revenue related to extended product warranty to be recognized in the fifth fiscal year following the latest fiscal year.

No definition available.

Name:	gnrc_ExtendedProductWarrantyAccrualDueInYearFive
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of deferred revenue related to extended product warranty to be recognized in the fourth fiscal year following the latest fiscal year.

No definition available.

Name:	gnrc_ExtendedProductWarrantyAccrualDueInYearFour
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of deferred revenue related to extended product warranty to be recognized in the third fiscal year following the latest fiscal year.

No definition available.

Name:	gnrc_ExtendedProductWarrantyAccrualDueInYearThree
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of deferred revenue related to extended product warranty to be recognized in the second fiscal year following the latest fiscal year.

No definition available.

Name:	gnrc_ExtendedProductWarrantyAccrualDueInYearTwo
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249