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Unobservable Input Reconciliation Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Fair value, assets measured on recurring basis, unobservable input reconciliation [Line Items]  
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings and Gain (Loss) Included in Other Comprehensive Income (Loss) $ (601)mchp_FairValueMeasuredonRecurringBasisGainLossIncludedinEarningsandGainLossIncludedinOtherComprehensiveIncomeLoss
Auction rate securities [Member]  
Fair value, assets measured on recurring basis, unobservable input reconciliation [Line Items]  
Fair value, measurement with unobservable inputs reconciliation, beginning 33,791us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember
Included in earnings 1,101us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember
Included in other comprehensive income (loss) (332)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember
Purchases, sales, issuances, and settlements, net (24,735)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember
Fair value, measurement with unobservable inputs reconciliation, ending 9,825us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember
Corporate Debt [Member]  
Fair value, assets measured on recurring basis, unobservable input reconciliation [Line Items]  
Fair value, measurement with unobservable inputs reconciliation, beginning 6,190us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
Included in earnings 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
Purchases, sales, issuances, and settlements, net 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
Fair value, measurement with unobservable inputs reconciliation, ending 6,190us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
Total Gains (Losses) [Member]  
Fair value, assets measured on recurring basis, unobservable input reconciliation [Line Items]  
Included in earnings (269)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= mchp_TotalGainsLossesMember
Included in other comprehensive income (loss) (332)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= mchp_TotalGainsLossesMember
Contingent consideration [Member]  
Fair value, assets measured on recurring basis, unobservable input reconciliation [Line Items]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) $ 20,470us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByLiabilityClassAxis
= mchp_ContingentConsiderationMember