Common stock, closing price per share.

No definition available.

Name:	amcc_CommonStockClosingPricePerShare
Namespace Prefix:	amcc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Quarters

+ References

No definition available.

+ Details

Name:	amcc_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodQuarters
Namespace Prefix:	amcc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Award Payout Percentage

+ References

No definition available.

+ Details

Name:	amcc_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsAwardPayoutPercentage
Namespace Prefix:	amcc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value

+ References

No definition available.

+ Details

Name:	amcc_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue
Namespace Prefix:	amcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in First Period of Employment

+ References

No definition available.

+ Details

Name:	amcc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInFirstPeriodOfEmployment
Namespace Prefix:	amcc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based compensation arrangement by share-based payment award, equity other than options, aggregate pre-tax intrinsic value.

+ References

No definition available.

+ Details

Name:	amcc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityOtherThanOptionsAggregatePreTaxIntrinsicValue
Namespace Prefix:	amcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based compensation arrangement by share-based payment award, equity other than options, aggregate pre-tax intrinsic value, released.

+ References

No definition available.

+ Details

Name:	amcc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityOtherThanOptionsAggregatePreTaxIntrinsicValueReleased
Namespace Prefix:	amcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based Compensation Arrangements by Share-based Payment Award, Award Vesting Percentage

+ References

No definition available.

+ Details

Name:	amcc_SharebasedCompensationArrangementsbySharebasedPaymentAwardAwardVestingPercentage
Namespace Prefix:	amcc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangements by Share-based Payment Award, Performance Period

+ References

No definition available.

+ Details

Name:	amcc_SharebasedCompensationArrangementsbySharebasedPaymentAwardPerformancePeriod
Namespace Prefix:	amcc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

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

- Details

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

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_AwardTypeAxis=amcc_PerformanceBasedMSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_OfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=amcc_FirstVestingPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=amcc_SecondVestingPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity - Restricted Stock Units (Details) (USD $)	12 Months Ended			1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Nov. 30, 2013	May 31, 2014	Oct. 31, 2014	May 31, 2013	Mar. 31, 2012
Class of Stock [Line Items]
Weighted average remaining contractual term for the restricted stock units outstanding, in years	1 year 2 months 12 days
Schedule of Restricted Stock Unit Activity
Options granted and outstanding	1,794,000	2,409,000	3,492,000					4,164,000
Allocated Share-based Compensation Expense	$ 18,300,000	$ 17,037,000	$ 24,089,000
Stock-based compensation expense	18,305,000us-gaap_ShareBasedCompensation	17,021,000us-gaap_ShareBasedCompensation	25,525,000us-gaap_ShareBasedCompensation
Aggregate pre-tax intrinsic value of restricted stock units outstanding which includes performance based awards which are subject to milestone attainments	22,100,000
Common stock closing price per share	$ 5.10amcc_CommonStockClosingPricePerShare
Value of restricted stock issued during period	11,600,000
Restricted Stock Units (RSUs)
Schedule of Restricted Stock Unit Activity
Outstanding at the end of the year	4,328,000
Allocated Share-based Compensation Expense	16,892,000	14,517,000	20,620,000
Restricted Stock Units (RSUs) \| 1992 Plan
Class of Stock [Line Items]
Vesting period, in years	4 years
Schedule of Restricted Stock Unit Activity
Number of shares vested	0
Award vesting period, quarters	12
Restricted Stock Units (RSUs) \| 2011 Equity Incentive Plan
Class of Stock [Line Items]
Vesting period, in years	4 years
Schedule of Restricted Stock Unit Activity
Number of shares vested	0
Award vesting period, quarters	12
Restricted Stock
Schedule of Restricted Stock Unit Activity
Outstanding at the beginning of the year	6,105,000	6,444,000	9,244,000
Awarded during the year	3,783,000	3,594,000	1,040,000
Vested during the year	(1,639,000)	(2,397,000)	(2,345,000)
Cancelled during the year	(3,921,000)	(1,536,000)	(1,495,000)
Outstanding at the end of the year	4,328,000	6,105,000	6,444,000
Performance-Based MSU
Schedule of Restricted Stock Unit Activity
Fair value				4,500,000
Minimum \| FY2015 Short-Term Incentive Plan
Schedule of Restricted Stock Unit Activity
Award payout percentage					50.00%
Minimum \| Performance-Based MSU
Schedule of Restricted Stock Unit Activity
Award vesting percentage per year				0.00%	0.00%	0.00%	0.00%
Maximum \| FY2015 Short-Term Incentive Plan
Schedule of Restricted Stock Unit Activity
Award payout percentage					150.00%
Maximum \| Performance-Based MSU
Schedule of Restricted Stock Unit Activity
Award vesting percentage per year				150.00%	150.00%	150.00%	150.00%
Officer \| Performance-Based RSU
Schedule of Restricted Stock Unit Activity
Awarded during the year				500,000
Vested during the year				(200,000)
Options granted and outstanding				300,000
Fair value				3,300,000
Allocated Share-based Compensation Expense	$ 2,800,000
First Vesting Period \| Performance-Based MSU
Schedule of Restricted Stock Unit Activity
Performance period				2 years	2 years	2 years	2 years
Second Vesting Period \| Performance-Based MSU
Schedule of Restricted Stock Unit Activity
Performance period				3 years	3 years	3 years	3 years