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EMPLOYEE BENEFIT PLANS (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Defined Benefit Plan Disclosure [Line Items]
Minimum contributions for plan	$ 3,000		$ 3,000
Contributions by company	800,000		2,100,000
Expenses related to defined contribution plan	500,000	500,000	1,600,000	1,500,000
Total contributions	800,000	500,000	2,100,000	1,600,000
Total contributions to the plan during the remainder of fiscal year	500,000
Frozen defined benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated cosf for defined benefit plans			$ 400,000

X

- Definition

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

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	rgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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X

- Definition

The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of administrative expenses incurred by a defined contribution plan.

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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