SUBSEQUENT EVENT (Details) (Subsequent event, Revolving Credit Agreement)	0 Months Ended
Jan. 21, 2013
Subsequent event \| Revolving Credit Agreement
Subsequent Event
Debt instrument covenant, leverage ratio	3.0

Represents the ratio of debt under the agreement relative to total indebtedness.

No definition available.

Name:	rgld_DebtInstrumentCovenantLeverageRatio
Namespace Prefix:	rgld_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration