| r0.c0 | RuleNode_120/Group [member] | | | | ifrs-full:ConsolidatedMember | N/A |
| r0.c1 | RuleNode_120/Company [member] | | | | ifrs-full:SeparateMember | N/A |
| r1.c0 | Trade and other non-current receivables [abstract]/Group [member] | ifrs-full:NoncurrentReceivablesAbstract | xbrli:stringItemType | duration | ifrs-full:ConsolidatedMember | N/A |
| r1.c1 | Trade and other non-current receivables [abstract]/Company [member] | ifrs-full:NoncurrentReceivablesAbstract | xbrli:stringItemType | duration | ifrs-full:SeparateMember | N/A |
| r2.c0 | Non-current trade receivables [abstract]/Group [member] | ssmt-mfrs:NoncurrentTradeReceivablesAbstract | xbrli:stringItemType | duration | ifrs-full:ConsolidatedMember | N/A |
| r2.c1 | Non-current trade receivables [abstract]/Company [member] | ssmt-mfrs:NoncurrentTradeReceivablesAbstract | xbrli:stringItemType | duration | ifrs-full:SeparateMember | N/A |
| r3.c0 | Trade receivables/Group [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromCustomers | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r3.c1 | Trade receivables/Company [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromCustomers | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r4.c0 | Trade receivables due from holding company/Group [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromHoldingCompany | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r4.c1 | Trade receivables due from holding company/Company [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromHoldingCompany | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r5.c0 | Trade receivables due from subsidiaries/Group [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromSubsidiaries | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r5.c1 | Trade receivables due from subsidiaries/Company [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromSubsidiaries | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r6.c0 | Trade receivables from associates/Group [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromAssociates | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r6.c1 | Trade receivables from associates/Company [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromAssociates | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r7.c0 | Trade receivables due from joint ventures/Group [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromJointVentures | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r7.c1 | Trade receivables due from joint ventures/Company [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromJointVentures | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r8.c0 | Trade receivables due from other related parties/Group [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromRelatedParties | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r8.c1 | Trade receivables due from other related parties/Company [member] | ssmt-mfrs:NoncurrentTradeReceivablesDueFromRelatedParties | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r9.c0 | Other non-current trade receivables/Group [member] | ssmt-mfrs:OtherNoncurrentTradeReceivables | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r9.c1 | Other non-current trade receivables/Company [member] | ssmt-mfrs:OtherNoncurrentTradeReceivables | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r10.c0 | Total non-current trade receivables/Group [member] | ifrs-full:NoncurrentTradeReceivables | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r10.c1 | Total non-current trade receivables/Company [member] | ifrs-full:NoncurrentTradeReceivables | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r11.c0 | Other non-current receivables [abstract]/Group [member] | ssmt-mfrs:OtherNoncurrentReceivablesAbstract | xbrli:stringItemType | duration | ifrs-full:ConsolidatedMember | N/A |
| r11.c1 | Other non-current receivables [abstract]/Company [member] | ssmt-mfrs:OtherNoncurrentReceivablesAbstract | xbrli:stringItemType | duration | ifrs-full:SeparateMember | N/A |
| r12.c0 | Other non-current receivables due from related parties [abstract]/Group [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromRelatedPartiesAbstract | xbrli:stringItemType | duration | ifrs-full:ConsolidatedMember | N/A |
| r12.c1 | Other non-current receivables due from related parties [abstract]/Company [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromRelatedPartiesAbstract | xbrli:stringItemType | duration | ifrs-full:SeparateMember | N/A |
| r13.c0 | Other receivables due from holding company/Group [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromHoldingCompany | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r13.c1 | Other receivables due from holding company/Company [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromHoldingCompany | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r14.c0 | Other receivables due from subsidiaries/Group [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromSubsidiaries | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r14.c1 | Other receivables due from subsidiaries/Company [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromSubsidiaries | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r15.c0 | Other receivables due from associates/Group [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromAssociates | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r15.c1 | Other receivables due from associates/Company [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromAssociates | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r16.c0 | Other receivables due from joint ventures/Group [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromJointVentures | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r16.c1 | Other receivables due from joint ventures/Company [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromJointVentures | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r17.c0 | Other receivables due from other related parties/Group [member] | ssmt-mfrs:MiscellaneousOtherNoncurrentReceivablesDueFromRelatedCompanies | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r17.c1 | Other receivables due from other related parties/Company [member] | ssmt-mfrs:MiscellaneousOtherNoncurrentReceivablesDueFromRelatedCompanies | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r18.c0 | Total other non-current receivables due from related parties/Group [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromRelatedParties | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r18.c1 | Total other non-current receivables due from related parties/Company [member] | ssmt-mfrs:OtherNoncurrentReceivablesDueFromRelatedParties | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r19.c0 | Non-current non-trade receivables [abstract]/Group [member] | ssmt-mfrs:OtherNoncurrentNontradeReceivablesAbstract | xbrli:stringItemType | duration | ifrs-full:ConsolidatedMember | N/A |
| r19.c1 | Non-current non-trade receivables [abstract]/Company [member] | ssmt-mfrs:OtherNoncurrentNontradeReceivablesAbstract | xbrli:stringItemType | duration | ifrs-full:SeparateMember | N/A |
| r20.c0 | Accrued income/Group [member] | ssmt-mfrs:OtherNoncurrentNontradePrepaymentAndAccruedIncome | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r20.c1 | Accrued income/Company [member] | ssmt-mfrs:OtherNoncurrentNontradePrepaymentAndAccruedIncome | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r21.c0 | Lease and hire purchase receivables/Group [member] | ssmt-mfrs:OtherNoncurrentNontradeLeaseAndHirePurchaseReceivables | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r21.c1 | Lease and hire purchase receivables/Company [member] | ssmt-mfrs:OtherNoncurrentNontradeLeaseAndHirePurchaseReceivables | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r22.c0 | Other non-current non-trade receivables/Group [member] | ssmt-mfrs:OtherNoncurrentNontradeMiscellaneous | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r22.c1 | Other non-current non-trade receivables/Company [member] | ssmt-mfrs:OtherNoncurrentNontradeMiscellaneous | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r23.c0 | Total non-current non-trade receivables/Group [member] | ssmt-mfrs:OtherNoncurrentNontradeReceivables | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r23.c1 | Total non-current non-trade receivables/Company [member] | ssmt-mfrs:OtherNoncurrentNontradeReceivables | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r24.c0 | Total other non-current receivables/Group [member] | ifrs-full:OtherNoncurrentReceivables | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r24.c1 | Total other non-current receivables/Company [member] | ifrs-full:OtherNoncurrentReceivables | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r25.c0 | Total trade and other non-current receivables/Group [member] | ifrs-full:NoncurrentReceivables | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r25.c1 | Total trade and other non-current receivables/Company [member] | ifrs-full:NoncurrentReceivables | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |