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Commitments and Contingencies - (Details)	Sep. 30, 2019
Environmental Contingencies
Ownership interest in domestic subsidiaries (as a percent)	100.00%

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- References

No definition available.

+ Details

Name:	rs_EnvironmentalContingenciesAbstract
Namespace Prefix:	rs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	rs_MajorityInterestOwnershipPercentageByParent
Namespace Prefix:	rs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant