| r0.c0 | RuleNode_339/Group [member] | | | | ifrs-full:ConsolidatedMember | N/A |
| r0.c1 | RuleNode_339/Company [member] | | | | ifrs-full:SeparateMember | N/A |
| r1.c0 | Non-current employee benefit liabilities [abstract]/Group [member] | ssmt-mfrs:NoncurrentEmployeeBenefitLiabilitiesAbstract | xbrli:stringItemType | duration | ifrs-full:ConsolidatedMember | N/A |
| r1.c1 | Non-current employee benefit liabilities [abstract]/Company [member] | ssmt-mfrs:NoncurrentEmployeeBenefitLiabilitiesAbstract | xbrli:stringItemType | duration | ifrs-full:SeparateMember | N/A |
| r2.c0 | Cash-settled share-based payment liability/Group [member] | ssmt-mfrs:NoncurrentCashSettledShareBasedPaymentLiability | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r2.c1 | Cash-settled share-based payment liability/Company [member] | ssmt-mfrs:NoncurrentCashSettledShareBasedPaymentLiability | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r3.c0 | Retirement benefits/Group [member] | ssmt-mfrs:NoncurrentRetirementBenefits | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r3.c1 | Retirement benefits/Company [member] | ssmt-mfrs:NoncurrentRetirementBenefits | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r4.c0 | Employment termination benefits/Group [member] | ssmt-mfrs:NoncurrentEmploymentTerminationBenefits | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r4.c1 | Employment termination benefits/Company [member] | ssmt-mfrs:NoncurrentEmploymentTerminationBenefits | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r5.c0 | Provision for unconsumed leave/Group [member] | ssmt-mfrs:NoncurrentProvisionForConsumedLeave | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r5.c1 | Provision for unconsumed leave/Company [member] | ssmt-mfrs:NoncurrentProvisionForConsumedLeave | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r6.c0 | Defined contribution plan/Group [member] | ssmt-mfrs:NoncurrentDefinedContributionPlan | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r6.c1 | Defined contribution plan/Company [member] | ssmt-mfrs:NoncurrentDefinedContributionPlan | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r7.c0 | Defined benefit plan/Group [member] | ssmt-mfrs:NoncurrentDefinedBenefitPlan | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r7.c1 | Defined benefit plan/Company [member] | ssmt-mfrs:NoncurrentDefinedBenefitPlan | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r8.c0 | Other non-current employee benefit liabilities/Group [member] | ssmt-mfrs:NoncurrentOtherEmployeeBenefitLiabilities | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r8.c1 | Other non-current employee benefit liabilities/Company [member] | ssmt-mfrs:NoncurrentOtherEmployeeBenefitLiabilities | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |
| r9.c0 | Total non-current employee benefit liabilities/Group [member] | ifrs-full:NoncurrentProvisionsForEmployeeBenefits | xbrli:monetaryItemType | instant | ifrs-full:ConsolidatedMember | iso4217:MYR |
| r9.c1 | Total non-current employee benefit liabilities/Company [member] | ifrs-full:NoncurrentProvisionsForEmployeeBenefits | xbrli:monetaryItemType | instant | ifrs-full:SeparateMember | iso4217:MYR |