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Components of deferred tax assets and liabilities (Details) (USD $)
Mar. 31, 2015
Mar. 31, 2014
Components of Deferred Tax Assets [Abstract]    
Deferred intercompany profit $ 10,865,000mchp_DeferredIntercompanyProfit $ 9,623,000mchp_DeferredIntercompanyProfit
Deferred income on shipments to distributors 34,493,000us-gaap_DeferredTaxAssetsDeferredIncome 28,596,000us-gaap_DeferredTaxAssetsDeferredIncome
Inventory valuation 9,605,000us-gaap_DeferredTaxAssetsInventory 6,072,000us-gaap_DeferredTaxAssetsInventory
Net operating loss carryforward 105,756,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 110,598,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capital loss carryforward 4,582,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 0us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Share-based compensation 26,780,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 24,494,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Income tax credits 115,893,000us-gaap_DeferredTaxAssetsOther 124,395,000us-gaap_DeferredTaxAssetsOther
Accrued expenses and other 671,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 28,227,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Gross deferred tax assets 308,645,000us-gaap_DeferredTaxAssetsGross 332,005,000us-gaap_DeferredTaxAssetsGross
Valuation allowances (116,482,000)us-gaap_DeferredTaxAssetsValuationAllowance (93,811,000)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net of valuation allowances 192,163,000us-gaap_DeferredTaxAssetsNet 238,194,000us-gaap_DeferredTaxAssetsNet
Components of Deferred Tax Liabilities [Abstract]    
Property, plant and equipment, principally due to differences in depreciation 2,236,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (1,942,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Convertible debentures (493,897,000)mchp_DeferredTaxLiabilitySeniorandJuniorConvertibleDebentures (530,338,000)mchp_DeferredTaxLiabilitySeniorandJuniorConvertibleDebentures
Other (10,649,000)us-gaap_DeferredTaxLiabilitiesOther (13,740,000)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities 502,310,000us-gaap_DeferredTaxLiabilities 546,020,000us-gaap_DeferredTaxLiabilities
Net deferred tax liability (310,147,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (307,826,000)us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred Tax Assets, Net, Current 71,045,000us-gaap_DeferredTaxAssetsNetCurrent 67,490,000us-gaap_DeferredTaxAssetsNetCurrent
Deferred Tax Liabilities, Noncurrent (381,192,000)us-gaap_DeferredTaxLiabilitiesNoncurrent (375,316,000)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax liability (310,147,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (307,826,000)us-gaap_DeferredTaxAssetsLiabilitiesNet
Unrecorded Tax Benefits Related to Share-Based Compensation $ 38,600,000mchp_UnrecordedTaxBenefitsRelatedToShareBasedCompensation