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REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS (Schedule of Revenue Recognized) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Revenue from Contract with Customer [Abstract]
Contract liabilities with customers at beginning of period		$ 3,646	$ 84	$ 9,623
Revenue deferred		150		4,843
Revenue recognized		(2,593)	(84)	(13,263)
Contract liabilities with customers at end of period		$ 1,203		$ 1,203

X

- Definition

The amount of deferred revenue recognized during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	rgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of revenue deferred during the period.

+ References

No definition available.

+ Details

Name:	rgr_RevenueDeferred
Namespace Prefix:	rgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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