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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available-for-sale Securities, Amortized Cost Basis $ 7,358us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 2,608us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Cash and Cash Equivalents, Fair Value Disclosure 5,538us-gaap_CashAndCashEquivalentsFairValueDisclosure [1] 339us-gaap_CashAndCashEquivalentsFairValueDisclosure  
Investments, Fair Value Disclosure 8,332us-gaap_InvestmentsFairValueDisclosure 3,397us-gaap_InvestmentsFairValueDisclosure  
Defined Benefit Plan, Fair Value of Plan Assets 50,426us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 48,613us-gaap_DefinedBenefitPlanFairValueOfPlanAssets  
Business Acquisition, Contingent Consideration, at Fair Value 2,500us-gaap_BusinessCombinationContingentConsiderationLiability 9,887us-gaap_BusinessCombinationContingentConsiderationLiability 5,453us-gaap_BusinessCombinationContingentConsiderationLiability
Unrealized Gain on AFS Securities 974ste_UnrealizedGainonAFSSecurities [2] 789ste_UnrealizedGainonAFSSecurities [2]  
Unrealized Loss on AFS Securities 0ste_UnrealizedLossonAFSSecurities [2] 0ste_UnrealizedLossonAFSSecurities  
Fair Value, Inputs, Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure 148,944us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [1] 137,189us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [1]  
Foreign Currency Contract, Asset, Fair Value Disclosure 0us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [3] 0us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [3]  
Foreign Currency Contracts, Liability, Fair Value Disclosure 0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [3] 0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [3]  
Investments, Fair Value Disclosure 8,332us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [4] 3,397us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [4]  
Defined Benefit Plan, Fair Value of Plan Assets 3,757us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [4] 3,495us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [4]  
Long-term Debt, Fair Value 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [5] 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [5]  
Business Acquisition, Contingent Consideration, at Fair Value 0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		 [6] 0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure 18,745us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [1] 15,613us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [1]  
Foreign Currency Contract, Asset, Fair Value Disclosure 12us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [3] 167us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [3]  
Foreign Currency Contracts, Liability, Fair Value Disclosure 616us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [3] 67us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [3]  
Investments, Fair Value Disclosure 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [4] 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		  
Defined Benefit Plan, Fair Value of Plan Assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [4] 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		  
Long-term Debt, Fair Value 641,131us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [5] 511,690us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [5]  
Business Acquisition, Contingent Consideration, at Fair Value 0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		 [6] 0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel2Member		  
Fair Value, Inputs, Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		  
Foreign Currency Contract, Asset, Fair Value Disclosure 0us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		 [3] 0us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		  
Foreign Currency Contracts, Liability, Fair Value Disclosure 0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		 [3] 0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		  
Investments, Fair Value Disclosure 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		 [4] 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		  
Defined Benefit Plan, Fair Value of Plan Assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		 [4] 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		  
Long-term Debt, Fair Value 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		 [5] 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		 [5]  
Business Acquisition, Contingent Consideration, at Fair Value 2,500us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		 [6] 9,887us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueInputsLevel3Member		 [6]  
Carrying (Reported) Amount, Fair Value Disclosure      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure 167,689us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [1] 152,802us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [1]  
Foreign Currency Contract, Asset, Fair Value Disclosure 12us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [3] 167us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [3]  
Foreign Currency Contracts, Liability, Fair Value Disclosure 616us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [3] 67us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [3]  
Investments, Fair Value Disclosure 8,332us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [4] 3,397us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [4]  
Defined Benefit Plan, Fair Value of Plan Assets 3,757us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [4] 3,495us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [4]  
Long-term Debt, Fair Value 623,250us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [5] 493,480us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [5]  
Business Acquisition, Contingent Consideration, at Fair Value 2,500us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [6] 9,887us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [6]  
Capital Additions      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 1,586us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_ContingentConsiderationByTypeAxis
= us-gaap_CapitalAdditionsMember		 5,083us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_ContingentConsiderationByTypeAxis
= us-gaap_CapitalAdditionsMember		  
Reductions and Payout [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (8,320)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_ContingentConsiderationByTypeAxis
= ste_ReductionsandPayoutMember		 (24)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_ContingentConsiderationByTypeAxis
= ste_ReductionsandPayoutMember		  
Contingent consideration gain loss      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   (374)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_ContingentConsiderationByTypeAxis
= ste_ContingentConsiderationGainLossMember		  
Foreign Currency Gain (Loss)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (653)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_ContingentConsiderationByTypeAxis
= us-gaap_ForeignCurrencyGainLossMember		 [7] (251)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_ContingentConsiderationByTypeAxis
= us-gaap_ForeignCurrencyGainLossMember		 [7]  
Cost of Sales      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Gain (Loss) on Sale of Commodity Contracts (373)us-gaap_GainLossOnSaleOfCommodityContracts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 (57)us-gaap_GainLossOnSaleOfCommodityContracts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 (217)us-gaap_GainLossOnSaleOfCommodityContracts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Mutual Funds [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 2,677us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ste_MutualFundsMember		 2,608us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ste_MutualFundsMember		  
Investments, Fair Value Disclosure 3,651us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ste_MutualFundsMember		 3,397us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ste_MutualFundsMember		  
Unrealized Gain on AFS Securities 974ste_UnrealizedGainonAFSSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ste_MutualFundsMember		 [2] 789ste_UnrealizedGainonAFSSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ste_MutualFundsMember		 [2]  
Unrealized Loss on AFS Securities 0ste_UnrealizedLossonAFSSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ste_MutualFundsMember		 [2] 0ste_UnrealizedLossonAFSSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ste_MutualFundsMember		  
Equity Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 4,681us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember		 0us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember		  
Investments, Fair Value Disclosure 4,681us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember		 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember		  
Unrealized Gain on AFS Securities 0ste_UnrealizedGainonAFSSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember		 [2] 0ste_UnrealizedGainonAFSSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember		 [2]  
Unrealized Loss on AFS Securities $ 0ste_UnrealizedLossonAFSSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember		 [2] $ 0ste_UnrealizedLossonAFSSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember		  
[1] Money market fund holdings are classified as level two as active market quoted prices are not available.
[2] (1) Amounts reported include the impact of foreign currency movements relative to the U.S. dollar.
[3] The fair values of forward and swap contracts are based on period-end forward rates and reflect the value of the amount that we would pay or receive for the contracts involving the same notional amounts and maturity dates.
[4] We maintain a frozen domestic non-qualified deferred compensation plan covering certain employees, which allows for the deferral of payment of previously earned compensation for an employee-specified term or until retirement or termination. Amounts deferred can be allocated to various hypothetical investment options (compensation deferrals have been frozen under the plan). We hold investments to satisfy the future obligations of the plan. Changes in the value of the investment accounts are recognized each period based on the fair value of the underlying investments. Employees who made deferrals are entitled to receive distributions of their hypothetical account balances (amounts deferred, together with earnings (losses)). We also hold an investment in the common stock of Servizi Italia, S.p.A, a leading provider of integrated linen washing and outsourced sterile processing services to hospital Customers. Changes in the value of the investment are recognized each period based on the fair value of the investment.
[5] We estimate the fair value of our long-term debt using discounted cash flow analyses, based on our current incremental borrowing rates for similar types of borrowing arrangements.
[6] Contingent consideration obligations arise from prior business acquisitions. The fair values are based on discounted cash flow analyses reflecting the possible achievement of specified performance measures or events and captures the contractual nature of the contingencies, commercial risk, and the time value of money. Contingent consideration obligations are classified in the consolidated balance sheets as accrued expense (short-term) and other liabilities (long-term), as appropriate based on the contractual payment dates.
[7] (1) Reported in other comprehensive income (loss)