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Operating Segment Information (Schedule of Operating Segment Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total net sales	$ 122,606us-gaap_SalesRevenueGoodsNet	$ 98,327us-gaap_SalesRevenueGoodsNet	$ 153,657us-gaap_SalesRevenueGoodsNet	$ 169,884us-gaap_SalesRevenueGoodsNet	$ 181,901us-gaap_SalesRevenueGoodsNet	$ 170,942us-gaap_SalesRevenueGoodsNet	$ 179,528us-gaap_SalesRevenueGoodsNet	$ 155,905us-gaap_SalesRevenueGoodsNet	$ 544,474us-gaap_SalesRevenueGoodsNet	$ 688,276us-gaap_SalesRevenueGoodsNet	$ 491,824us-gaap_SalesRevenueGoodsNet
Income (Loss) Before Income Taxes									57,240us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	175,232us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	112,109us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Identifiable Assets	254,382us-gaap_Assets				277,118us-gaap_Assets				254,382us-gaap_Assets	277,118us-gaap_Assets	174,486us-gaap_Assets
Depreciation									35,915us-gaap_Depreciation	19,576us-gaap_Depreciation	14,236us-gaap_Depreciation
Capital Expenditures									45,571us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	54,616us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	27,282us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Firearms [Member]
Segment Reporting Information [Line Items]
Total net sales									542,267us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	678,552us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	484,933us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember
Income (Loss) Before Income Taxes									57,525us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	177,736us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	113,660us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember
Identifiable Assets	211,338us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember				201,660us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember				211,338us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	201,660us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	120,879us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember
Depreciation									33,594us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	18,679us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	13,413us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember
Capital Expenditures									39,511us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	51,536us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember	26,773us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = rgr_FirearmsMember
Castings [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes									(1,294)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember	(3,866)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember	(1,858)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember
Identifiable Assets	16,772us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember				11,402us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember				16,772us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember	11,402us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember	6,467us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember
Depreciation									2,321us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember	897us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember	823us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember
Capital Expenditures									6,060us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember	3,080us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember	509us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsMember
Unaffiliated [Member]
Segment Reporting Information [Line Items]
Total net sales									2,207us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_UnaffiliatedMember	9,724us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_UnaffiliatedMember	6,891us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_UnaffiliatedMember
Intersegment [Member]
Segment Reporting Information [Line Items]
Total net sales									34,095us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_IntersegmentMember	32,794us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_IntersegmentMember	26,462us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_IntersegmentMember
Castings, net [Member]
Segment Reporting Information [Line Items]
Total net sales									36,302us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsNetMember	42,518us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsNetMember	33,353us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = rgr_CastingsNetMember
Eliminations [Member]
Segment Reporting Information [Line Items]
Total net sales									(34,095)us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember	(32,794)us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember	(26,462)us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Corporate [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes									1,009us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	1,362us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	307us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Identifiable Assets	$ 26,272us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember				$ 64,056us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember				$ 26,272us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ 64,056us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ 47,140us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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