| COVER PAGE | Apr. 09, 2020 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Apr. 9, 2020 |
| Entity Registrant Name | MICROCHIP TECHNOLOGY INCORPORATED |
| Entity Central Index Key | 0000827054 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 0-21184 |
| Entity Tax Identification Number | 86-0629024 |
| Entity Address, Address Line One | 2355 West Chandler Boulevard |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.001 par value per share |
| Trading Symbol | MCHP |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
