 | ifrs-full:AdjustmentsForDepreciationExpense | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:AdjustmentsForAmortisationExpense | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:AdjustmentsForDividendIncome | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:AdjustmentsForSharebasedPayments | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:AdjustmentsForGainsLossesOnFairValueAdjustmentInvestmentProperty | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:AdjustmentsForUnrealisedForeignExchangeGainLoss | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:AdjustmentsForInterestIncome | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:AdjustmentsForPerformanceBasedEmployeeShareSchemeAndOtherExpenses | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:AdjustmentsForShareOfProfitsOfJointVentures | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:AdjustmentsForShareOptionExpenses | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:AdjustmentsForUndistributedProfitsOfAssociates | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:AdjustmentsForFinanceCosts | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:AdjustmentsForFinanceIncome | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:PaymentsForLeasesOfLowValueAssetsAndVariableLeasePaymentsNotIncludedInMeasurementOfLeaseLiability | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:AdjustmentsForOtherNoncurrentAssets | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:ImpairmentLossRecognisedInProfitOrLoss | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:GainsLossesOnDisposalsOfNoncurrentAssets | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:GainsLossesOnDisposalOfSubsidiaries | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:GainsLossesOnDisposalOfAssociates | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:GainsLossesOnDisposalOfJointVentures | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:GainsLossesOnDisposalOfOtherInvestments | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:RealisedGainTransferredFromEquityOnForeignCurrencyExchange | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:OtherAdjustmentsForNoncashItems | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:WritedownsReversalsOfAssets | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ssmt-mfrs:WriteBackOfExpenses | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |
 | ifrs-full:OtherAdjustmentsToReconcileProfitLoss | summation-item | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-fs-mfrs_2017-12-31/ssmt-fs-mfrs_2017-12-31_role-500100 |