 | ifrs-full:AdjustmentsForDepreciationExpense | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForAmortisationExpense | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForDividendIncome | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForSharebasedPayments | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForGainsLossesOnFairValueAdjustmentInvestmentProperty | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:AdjustmentsForUnrealisedForeignExchangeGainLoss | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:AdjustmentsForPerformanceBasedEmployeeShareSchemeAndOtherExpenses | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:AdjustmentsForShareOfProfitsOfJointVentures | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:AdjustmentsForShareOptionExpenses | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForUndistributedProfitsOfAssociates | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForFinanceCosts | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForFinanceIncome | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:PaymentsForLeasesOfLowValueAssetsAndVariableLeasePaymentsNotIncludedInMeasurementOfLeaseLiability | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:AdjustmentsForOtherNoncurrentAssets | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:AdjustmentsForImpairmentLossRecognisedInProfitOrLossAbstract | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:GainsLossesOnDisposalsOfNoncurrentAssetsAbstract | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:GainsLossesOnDisposalOfSubsidiaries | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:GainsLossesOnDisposalOfAssociates | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:GainsLossesOnDisposalOfJointVentures | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:GainsLossesOnDisposalOfOtherInvestments | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:RealisedGainTransferredFromEquityOnForeignCurrencyExchange | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:OtherAdjustmentsForNoncashItems | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:WriteOffOfAssetsAbstract | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:OtherAdjustmentsToReconcileProfitLoss | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForReconcileProfitLoss | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForInterestIncome | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ssmt-mfrs:WriteBackOfExpenses | parent-child | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100y |
 | ifrs-full:AdjustmentsForDepreciationExpense | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:AdjustmentsForAmortisationExpense | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:AdjustmentsForDividendIncome | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:AdjustmentsForSharebasedPayments | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:AdjustmentsForGainsLossesOnFairValueAdjustmentInvestmentProperty | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:AdjustmentsForUnrealisedForeignExchangeGainLoss | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:AdjustmentsForInterestIncome | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:AdjustmentsForPerformanceBasedEmployeeShareSchemeAndOtherExpenses | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:AdjustmentsForShareOfProfitsOfJointVentures | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:AdjustmentsForShareOptionExpenses | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:AdjustmentsForUndistributedProfitsOfAssociates | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:AdjustmentsForFinanceCosts | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:AdjustmentsForFinanceIncome | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:PaymentsForLeasesOfLowValueAssetsAndVariableLeasePaymentsNotIncludedInMeasurementOfLeaseLiability | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:AdjustmentsForOtherNoncurrentAssets | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:AdjustmentsForImpairmentLossRecognisedInProfitOrLossAbstract | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:GainsLossesOnDisposalsOfNoncurrentAssetsAbstract | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:GainsLossesOnDisposalOfSubsidiaries | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:GainsLossesOnDisposalOfAssociates | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:GainsLossesOnDisposalOfJointVentures | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:GainsLossesOnDisposalOfOtherInvestments | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:RealisedGainTransferredFromEquityOnForeignCurrencyExchange | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:OtherAdjustmentsForNoncashItems | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:WriteOffOfAssetsAbstract | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ssmt-mfrs:WriteBackOfExpenses | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:OtherAdjustmentsToReconcileProfitLoss | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |
 | ifrs-full:AdjustmentsForReconcileProfitLoss | domain-member | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-520000 |