Debt Instrument Additional Basis On Variable Rate Base

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Period Type:	instant

- Definition

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

+ Details

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

+ Details

Name:	mchp_DebtInstrumentInterestRateSpreadOnOverduePrincipalInEventOfDefault
Namespace Prefix:	mchp
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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.

+ 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

+ Details

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

- Definition

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

+ Details

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Namespace Prefix:	us-gaap
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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.

+ Details

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

- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

Reference 3: 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

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate
Namespace Prefix:	us-gaap
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Reflects when the credit facility first became available, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInitiationDate
Namespace Prefix:	us-gaap
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

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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

Credit facility (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2011	Aug. 12, 2011
Debt Instrument Interest Rate Option1 [Member] \| Minimum [Member] \| Line of Credit [Member] \| Credit Agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Debt Instrument Interest Rate Option1 [Member] \| Maximum [Member] \| Line of Credit [Member] \| Credit Agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Debt Instrument Interest Rate Option1 [Member] \| Line of Credit [Member] \| Credit Agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, 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%
Debt Instrument Additional Basis On Variable Rate Base		0.50%
Debt Instrument Interest Rate Option 2 [Member] \| Minimum [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Debt Instrument Interest Rate Option 2 [Member] \| Maximum [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.50%
Debt Instrument Interest Rate Option 2 [Member] \| Line of Credit [Member] \| Credit Agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Description of Variable Rate Basis	adjusted LIBOR rate (based on one, two, three, or six-month interest periods)
Debt Instrument Additional Basis On Variable Rate Base		1.00%
Line of Credit [Member] \| Credit Agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]
Period For Leverage Ratio To Determine Interest Rate Spread	preceding four fiscal quarter period
Debt Instrument Interest Rate Spread On Overdue Principal In Event Of Default		2.00%
Debt Instrument Interest Rate Spread On Overdue Amounts In Event Of Default		2.00%
Line of Credit Facility Foreign Currency Sublimit [Member] \| Credit Agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		100
Line of Credit Facility Swingline Loan Sublimit [Member] \| Credit Agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		15
Line of Credit Facility Letter of Credit Sublimit [Member] \| Credit Agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		25
Credit Agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Initiation Date	August 12, 2011
Line of Credit Facility, Maximum Borrowing Capacity		750
Line of Credit Facility, Expiration Date	August 12, 2016
Line of Credit Facility Increase Option		250