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OPERATING SEGMENT INFORMATION (Schedule of Operating Segment Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total net sales	$ 136,954us-gaap_SalesRevenueGoodsNet	$ 169,884us-gaap_SalesRevenueGoodsNet
Income (Loss) Before Income Taxes	24,223us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	38,298us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Identifiable Assets	267,643us-gaap_Assets		254,382us-gaap_Assets
Firearms [Member]
Segment Reporting Information [Line Items]
Total net sales	135,579us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	169,162us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember
Income (Loss) Before Income Taxes	25,129us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	38,703us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember
Identifiable Assets	209,706us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember		211,338us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember
Castings [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	(1,471)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember	(541)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember
Identifiable Assets	16,246us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember		16,772us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember
Unaffiliated [Member]
Segment Reporting Information [Line Items]
Total net sales	1,375us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_UnaffiliatedMember	722us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_UnaffiliatedMember
Intersegment [Member]
Segment Reporting Information [Line Items]
Total net sales	7,544us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_IntersegmentMember	9,454us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_IntersegmentMember
Castings, net [Member]
Segment Reporting Information [Line Items]
Total net sales	8,919us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsNetMember	10,176us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsNetMember
Eliminations [Member]
Segment Reporting Information [Line Items]
Total net sales	(7,544)us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember	(9,454)us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Corporate [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	565us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	136us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Identifiable Assets	$ 41,691us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember		$ 26,272us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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