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COVER PAGE - USD ($)
 12 Months Ended
Mar. 31, 2020
May 14, 2020
Sep. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2020    
Document Transition Report false    
Entity File Number 0-21184    
Entity Registrant Name MICROCHIP TECHNOLOGY INCORPORATED    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 86-0629024    
Entity Address, Address Line One 2355 W. Chandler Blvd.    
Entity Address, City or Town Chandler    
Entity Address, State or Province AZ    
Entity Address, Postal Zip Code 85224-6199    
City Area Code 480    
Local Phone Number 792-7200    
Title of 12(b) Security Common Stock, $0.001 Par Value Per Share    
Trading Symbol MCHP    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 21,697,205,962
Entity Common Stock, Shares Outstanding   245,332,497  
Documents Incorporated by Reference
Documents Incorporated by Reference
Document
 
Part of Form 10-K
Annual Report on Form 10-K for the fiscal year ended March 31, 2019
 
II
Proxy Statement for the 2020 Annual Meeting of Stockholders
 
III

    
Entity Central Index Key 0000827054    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false