Total Consideration, Extinguishment of Debt

No definition available.

Name:	mchp_TotalConsiderationExtinguishmentofDebt
Namespace Prefix:	mchp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total Consideration, Extinguishment of Debt, Equity Component

+ References

No definition available.

+ Details

Name:	mchp_TotalConsiderationExtinguishmentofDebtEquityComponent
Namespace Prefix:	mchp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total Consideration, Extinguishment of Debt, Liability Component

+ References

No definition available.

+ Details

Name:	mchp_TotalConsiderationExtinguishmentofDebtLiabilityComponent
Namespace Prefix:	mchp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_ProceedsFromLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfConvertibleDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The gross value of stock issued during the period upon the conversion of convertible securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=mchp_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_BridgeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mchp_A2015SeniorSubordinatedConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mchp_A2017SeniorSubordinatedConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mchp_A2017JuniorSubordinatedConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mchp_A2020SeniorSubordinatedConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=mchp_A2017SeniorSubordinatedConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=mchp_A2017JuniorSubordinatedConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mchp_SeniorSecuredNotes09722024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Settlement of debt (Details) - USD ($) $ in Millions	1 Months Ended					12 Months Ended
Debt - Settlement of debt (Details) - USD ($) $ in Millions	Feb. 28, 2021	Dec. 31, 2020	Aug. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Cash Paid						$ 2,611.4	$ 615.0	$ 0.0
Value of Shares Issued						3,171.1	351.8
Loss on settlement of debt						(299.6)	(5.4)	(12.6)
Principal amount, debt					$ 10,593.3	9,209.4	10,593.3
Term Loan Facility
Debt Instrument [Line Items]
Proceeds from borrowings under line of credit						0.0	0.0	3,000.0
Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from borrowings under line of credit		$ 213.0				3,966.0	1,026.0	$ 4,416.5
Bridge Loan Facility
Debt Instrument [Line Items]
Principal amount, debt					615.0	0.0	615.0
Senior Indebtedness
Debt Instrument [Line Items]
Principal amount, debt					6,727.0	7,946.6	6,727.0
Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled		1,086.5
Cash Paid		428.9
Long-term Debt \| Bridge Loan Facility
Debt Instrument [Line Items]
Principal Amount Settled				$ 615.0
Cash Paid				615.0
Total consideration, extinguishment of debt				615.0
Loss on settlement of debt				5.3
Line of Credit \| Term Loan Facility
Debt Instrument [Line Items]
Principal Amount Settled		1,705.7		17.8
Cash Paid		1,705.7		17.8
Total consideration, extinguishment of debt		1,705.7		17.8
Loss on settlement of debt		12.9
2015 Senior Convertible Debt \| Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled	$ 81.0	90.0	$ 414.3	383.3	615.0
Cash Paid	81.0	48.5	414.3	383.3	615.0
Value of Shares Issued	206.5	221.0	547.6	405.1	351.8
Total consideration, extinguishment of debt	287.5	269.5	961.9	788.4	966.8
Total consideration, extinguishment of debt, liability component	79.2	79.4	351.7	314.4	460.4
Total consideration, extinguishment of debt, equity component	208.1	184.5	592.3	464.4	461.1
Loss on settlement of debt	10.7	9.4	25.0	7.8	3.4
2017 Senior Convertible Debt \| Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled	122.2	588.8	381.8	643.9
Cash Paid	122.2	155.4	381.8	643.9
Value of Shares Issued	166.4	408.7	221.1	246.4
Total consideration, extinguishment of debt	288.6	1,165.6	602.9	890.3
Total consideration, extinguishment of debt, liability component	115.9	486.7	299.0	481.0
Total consideration, extinguishment of debt, equity component	168.2	655.3	292.2	390.9
Loss on settlement of debt	25.5	57.0	$ 20.1	$ 13.7
2017 Junior Convertible Debt \| Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled	156.0	407.7
Cash Paid	156.0	225.0
Value of Shares Issued	217.9	530.4
Total consideration, extinguishment of debt	373.9	819.4
Total consideration, extinguishment of debt, liability component	129.8	246.3
Total consideration, extinguishment of debt, equity component	243.9	547.1
Loss on settlement of debt	$ 49.4	62.8
2020 Senior Convertible Debt \| Long-term Debt
Debt Instrument [Line Items]
Debt conversion, converted instrument amount		665.5
2020 Senior Convertible Debt \| Long-term Debt \| 2017 Senior Convertible Debt
Debt Instrument [Line Items]
Debt conversion, converted instrument amount		601.5
2020 Senior Convertible Debt \| Long-term Debt \| 2017 Junior Convertible Debt
Debt Instrument [Line Items]
Debt conversion, converted instrument amount		$ 64.0
0.972% 2024 Notes \| Senior Indebtedness
Debt Instrument [Line Items]
Debt instrument, face amount						1,400.0
Principal amount, debt					$ 0.0	$ 1,400.0	$ 0.0