- DefinitionTabular disclosure of detailed information about deferred income other than contract liabilities.
| Name: |
gsm_DisclosureOfDeferredIncomeOtherThanContractLiabilitiesTableTextBlock |
| Namespace Prefix: |
gsm_ |
| Data Type: |
dtr-types:textBlockItemType |
| Balance Type: |
na |
| Period Type: |
duration |