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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Retirement Benefits [Abstract]
Expenses related to defined contribution plan	$ 0.9	$ 1.2
Future defined contribution plans	2.7
Supplemental discretionary contributions	1.5	$ 1.7
Supplemental contributions to the plan during the remainder of fiscal year	$ 4.0

X

- Definition

Amount of contributions made by the employer to the plan during the remainder of fiscal year.

+ References

No definition available.

+ Details

Name:	rgr_DefinedBenefitPlanContributionsByEmployerForRemainderOfFiscalYear
Namespace Prefix:	rgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount represents the total cost estimated by the company for defined benefit plans.

+ References

No definition available.

+ Details

Name:	rgr_EstimatedCostForDefinedBenefitPlans
Namespace Prefix:	rgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of administrative expense incurred by defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanAdministrativeExpenses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration