COVER PAGE - shares	9 Months Ended
	Dec. 31, 2019	Jan. 29, 2020
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2019
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
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
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	MCHP
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		239,538,076
Entity Central Index Key	0000827054
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false