| r0.c0 | RuleNode_401/Group [member] | | | | ifrs-full:ConsolidatedMember | N/A |
| r0.c1 | RuleNode_401/Company [member] | | | | ifrs-full:SeparateMember | N/A |
| r1.c0 | Non-current derivative financial liabilities [abstract]/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesAbstract | xbrli:stringItemType | duration | ifrs-full:ConsolidatedMember | N/A |
| r1.c1 | Non-current derivative financial liabilities [abstract]/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesAbstract | xbrli:stringItemType | duration | ifrs-full:SeparateMember | N/A |
| r2.c0 | Non-current derivatives at fair value through profit or loss [abstract]/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract | xbrli:stringItemType | duration | ifrs-full:ConsolidatedMember | N/A |
| r2.c1 | Non-current derivatives at fair value through profit or loss [abstract]/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract | xbrli:stringItemType | duration | ifrs-full:SeparateMember | N/A |
| r3.c0 | Forward contract/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesForwardContract | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r3.c1 | Forward contract/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesForwardContract | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r4.c0 | Options/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesOptions | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r4.c1 | Options/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesOptions | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r5.c0 | Swap/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesSwaps | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r5.c1 | Swap/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesSwaps | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r6.c0 | Other derivatives/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesOtherDerivatives | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r6.c1 | Other derivatives/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesOtherDerivatives | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r7.c0 | Total non-current derivatives at fair value through profit or loss/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesAtFairValueThroughProfitOrLoss | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r7.c1 | Total non-current derivatives at fair value through profit or loss/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesAtFairValueThroughProfitOrLoss | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r8.c0 | Non-current derivatives used for hedging [abstract]/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesUsedForHedgingAbstract | xbrli:stringItemType | duration | ifrs-full:ConsolidatedMember | N/A |
| r8.c1 | Non-current derivatives used for hedging [abstract]/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesUsedForHedgingAbstract | xbrli:stringItemType | duration | ifrs-full:SeparateMember | N/A |
| r9.c0 | Forward contract/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesForwardContractUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r9.c1 | Forward contract/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesForwardContractUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r10.c0 | Options/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitesOptionsUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r10.c1 | Options/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitesOptionsUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r11.c0 | Swap/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesSwapUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r11.c1 | Swap/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesSwapUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r12.c0 | Other derivatives/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesOtherDerivativesUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r12.c1 | Other derivatives/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesOtherDerivativesUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r13.c0 | Total non-current derivatives used for hedging/Group [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r13.c1 | Total non-current derivatives used for hedging/Company [member] | ssmt-mfrs:NoncurrentDerivativeFinancialLiabilitiesUsedForHedging | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r14.c0 | Other non-current derivative financial liabilities/Group [member] | ssmt-mfrs:OtherNoncurrentDerivativeFinancialLiabilities | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r14.c1 | Other non-current derivative financial liabilities/Company [member] | ssmt-mfrs:OtherNoncurrentDerivativeFinancialLiabilities | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r15.c0 | Total non-current derivative financial liabilities/Group [member] | ifrs-full:NoncurrentDerivativeFinancialLiabilities | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r15.c1 | Total non-current derivative financial liabilities/Company [member] | ifrs-full:NoncurrentDerivativeFinancialLiabilities | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |