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Equity Incentive Plans, Stock Compensation Expensed (Details) (USD $)
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Stock-based compensation expense [Line Items]      
Allocated share based compensation expense $ 47,956,000us-gaap_AllocatedShareBasedCompensationExpense $ 48,065,000us-gaap_AllocatedShareBasedCompensationExpense $ 48,977,000us-gaap_AllocatedShareBasedCompensationExpense
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 94,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 0 months 0 days    
Inventory [Member]      
Stock-based compensation expense [Line Items]      
Amount of share-based compensation expense capitalized to inventory 6,800,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_IncomeStatementLocationAxis
= mchp_InventoryMember		 7,400,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_IncomeStatementLocationAxis
= mchp_InventoryMember		 5,900,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_IncomeStatementLocationAxis
= mchp_InventoryMember
Cost of sales [Member]      
Stock-based compensation expense [Line Items]      
Allocated share based compensation expense 9,010,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 [1] 7,340,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 [1] 8,234,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 [1]
Research and development [Member]      
Stock-based compensation expense [Line Items]      
Allocated share based compensation expense 28,164,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 24,554,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 22,178,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Selling, general and administrative [Member]      
Stock-based compensation expense [Line Items]      
Allocated share based compensation expense 21,422,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 21,893,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 27,603,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Pre-tax effect of share based compensation [Member]      
Stock-based compensation expense [Line Items]      
Allocated share based compensation expense 58,596,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= mchp_PretaxEffectOfShareBasedCompensationMember		 53,787,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= mchp_PretaxEffectOfShareBasedCompensationMember		 58,015,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= mchp_PretaxEffectOfShareBasedCompensationMember
Income tax benefit [Member]      
Stock-based compensation expense [Line Items]      
Allocated share based compensation expense $ 10,640,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= mchp_IncomeTaxBenefitMember		 $ 5,722,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= mchp_IncomeTaxBenefitMember		 $ 9,038,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= mchp_IncomeTaxBenefitMember
[1] During the year ended March 31, 2015, $6.8 million of share-based compensation expense was capitalized to inventory, and $9.0 million of previously capitalized share-based compensation expense in inventory was sold. During the year ended March 31, 2014, $7.4 million of share-based compensation expense was capitalized to inventory, and $7.3 million of previously capitalized share-based compensation expense in inventory was sold. During the year ended March 31, 2013, $5.9 million of share-based compensation expense was capitalized to inventory, and $8.2 million of previously capitalized share-based compensation expense in inventory was sold.