Debt Instrument Interest Rate Spread On Overdue Amounts In Event Of Default

No definition available.

Name:	mchp_DebtInstrumentInterestRateSpreadOnOverdueAmountsInEventOfDefault
Namespace Prefix:	mchp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument Interest Rate Spread On Overdue Principal In Event Of Default

+ References

No definition available.

+ Details

Name:	mchp_DebtInstrumentInterestRateSpreadOnOverduePrincipalInEventOfDefault
Namespace Prefix:	mchp_
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Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility Increase Option - An increase option in the credit agreement which provides, subject to certain requirements, the Company to arrange with existing lenders and/or new lenders to provide up to an aggregate of $250 million in additional commitments, whether for revolving loans or term loans.

+ References

No definition available.

+ Details

Name:	mchp_LineOfCreditFacilityIncreaseOption
Namespace Prefix:	mchp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period For Leverage Ratio To Determine Interest Rate Spread

+ References

No definition available.

+ Details

Name:	mchp_PeriodForLeverageRatioToDetermineInterestRateSpread
Namespace Prefix:	mchp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.9)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 9

-Article 9

+ Details

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611

+ Details

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

- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInitiationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Weighted average interest rate of short-term debt outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph b

-Article 5

+ Details

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Balance Type:	na
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Credit facility (Details) (USD $)	3 Months Ended		6 Months Ended
Credit facility (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 27, 2013
Line of Credit Facility [Line Items]
Interest expense	$ 14,019,000	$ 12,354,000	$ 27,697,000	$ 24,210,000
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit Facility [Line Items]
Initiation date			Jun. 27, 2013
Credit agreement					2,000,000,000.0
Maturity Date			Jun. 27, 2018
Increase option amount					300,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	965,600,000.0		965,600,000.0
Debt discount	1,000,000		1,000,000
Interest expense	5,100,000	4,000,000	10,100,000	7,500,000
Short-term Debt, Weighted Average Interest Rate	1.65%		1.65%
Credit Agreement Maturity June 27, 2018 [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Period for leverage ratio to determine interest rate spread			preceding four fiscal quarter period
Interest rate spread on overdue principal in event of default (percentage)					2.00%
Interest rate spread on overdue amounts in event of default (percentage)					2.00%
Credit Agreement Maturity June 27, 2018 [Member] \| Line of Credit [Member] \| Debt Instrument Interest Rate Option1 [Member]
Line of Credit Facility [Line Items]
Description of variable rate basis			the highest of JPMorgan Chase Bank, N.A.'s prime rate, the federal funds rate plus a margin equal to 0.50% and the adjusted LIBOR rate for a 1-month interest period plus a margin equal to 1.00%
Credit Agreement Maturity June 27, 2018 [Member] \| Line of Credit [Member] \| Debt Instrument Interest Rate Option1 [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)			0.25%
Credit Agreement Maturity June 27, 2018 [Member] \| Line of Credit [Member] \| Debt Instrument Interest Rate Option1 [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)			1.25%
Credit Agreement Maturity June 27, 2018 [Member] \| Line of Credit [Member] \| Debt Instrument Interest Rate Option 2 [Member]
Line of Credit Facility [Line Items]
Description of variable rate basis			adjusted LIBOR rate (based on one, two, three, or six-month interest periods)
Credit Agreement Maturity June 27, 2018 [Member] \| Line of Credit [Member] \| Debt Instrument Interest Rate Option 2 [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)			1.25%
Credit Agreement Maturity June 27, 2018 [Member] \| Line of Credit [Member] \| Debt Instrument Interest Rate Option 2 [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)			2.25%
Credit Agreement Maturity June 27, 2018 [Member] \| Term loan [Member]
Line of Credit Facility [Line Items]
Credit agreement					350,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	341,200,000		341,200,000
Credit Agreement Maturity June 27, 2018 [Member] \| Revolving credit facility [Member]
Line of Credit Facility [Line Items]
Credit agreement					1,650,000,000.00
Line of Credit Facility, Fair Value of Amount Outstanding	624,400,000		624,400,000
Credit Agreement Maturity June 27, 2018 [Member] \| Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit agreement					125,000,000
Credit Agreement Maturity June 27, 2018 [Member] \| Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Credit agreement					35,000,000
Credit Agreement Maturity June 27, 2018 [Member] \| Line of Credit Facility Swingline Loan Sublimit [Member]
Line of Credit Facility [Line Items]
Credit agreement					$ 25,000,000