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Leases - Schedule of Non-Cancelable Operating Lease Maturities (Details) $ in Millions | Jun. 30, 2019 USD ($)
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Leases [Abstract] |
2020 | $ 49.0
2021 | 38.2
2022 | 30.3
2023 | 18.0
2024 | 9.1
Thereafter | 22.6
Total lease liabilities | $ 167.2

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- Definition Lessee, Non-Cancelable Operating Lease, Liability, Payments, Due Year Five + References No definition available. + Details
Name: | mchp_LesseeNonCancelableOperatingLeaseLiabilityPaymentsDueYearFive
Namespace Prefix: | mchp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Non-Cancelable Operating Lease, Liability, Payments, Due Year Four + References No definition available. + Details
Name: | mchp_LesseeNonCancelableOperatingLeaseLiabilityPaymentsDueYearFour
Namespace Prefix: | mchp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Non-Cancelable Operating Lease, Liability, Payments, Due Year Three + References No definition available. + Details
Name: | mchp_LesseeNonCancelableOperatingLeaseLiabilityPaymentsDueYearThree
Namespace Prefix: | mchp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Non-Cancelable Operating Lease, Liability, Payments, Due Year Two + References No definition available. + Details
Name: | mchp_LesseeNonCancelableOperatingLeaseLiabilityPaymentsDueYearTwo
Namespace Prefix: | mchp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Non-Cancelable Operating Lease, Liability, Payments, Due after Year Five + References No definition available. + Details
Name: | mchp_LesseeNonCancelableOperatingLeaseLiabilityPaymentsDueafterYearFive
Namespace Prefix: | mchp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Non-Cancelable Operating Lease, Liability, Payments, Remainder of Fiscal Year + References No definition available. + Details
Name: | mchp_LesseeNonCancelableOperatingLeaseLiabilityPaymentsRemainderofFiscalYear
Namespace Prefix: | mchp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Non-Cancelable Operating Lease, Liability + References No definition available. + Details
Name: | mchp_NonCancelableOperatingLeaseLiability
Namespace Prefix: | mchp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration