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Employee Benefit Plans (Defined Benefit Plans Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 9 Months Ended
Mar. 31, 2015
Dec. 31, 2013
Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 92.0us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation   $ 83.2us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Company's expected contribution to defined benefit pension plans in next fiscal year $ 4.7us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear    
Swiss defined benefit pension plan | Minimum | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
28.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Swiss defined benefit pension plan | Minimum | Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 25.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_BondsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Swiss defined benefit pension plan | Minimum | Swiss Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations   33.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= logi_SwissBondsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Swiss defined benefit pension plan | Minimum | Foreign Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations   5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= logi_ForeignBondsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Swiss defined benefit pension plan | Minimum | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations   5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Swiss defined benefit pension plan | Minimum | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Swiss defined benefit pension plan | Maximum | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 55.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
43.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Swiss defined benefit pension plan | Maximum | Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_BondsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Swiss defined benefit pension plan | Maximum | Swiss Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations   63.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= logi_SwissBondsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Swiss defined benefit pension plan | Maximum | Foreign Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations   15.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= logi_ForeignBondsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Swiss defined benefit pension plan | Maximum | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations   15.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Swiss defined benefit pension plan | Maximum | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 10.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DomesticPensionPlansOfForeignEntityDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Other Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset percentage 7.20%logi_DefinedBenefitPlanAssetPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember