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Subsequent Event (Details) $ in Millions	Apr. 21, 2021 USD ($)
Subsequent events
Subsequent Events
Additional amount of letters of credit available to be issued	$ 50.0

X

- Definition

The total additional amount of letters of credit available to be issued as of the reporting date.

+ References

No definition available.

+ Details

Name:	rs_LettersOfCreditAdditionalIssuanceCapacity
Namespace Prefix:	rs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: