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v3.19.3

Commitments and Contingencies - (Details) | Sep. 30, 2019
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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