Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Operating activities:
Net loss	$ (52,058)us-gaap_NetIncomeLoss	$ (5,694)us-gaap_NetIncomeLoss	$ (134,115)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	8,555us-gaap_Depreciation	10,273us-gaap_Depreciation	9,542us-gaap_Depreciation
Amortization of purchased intangible assets	104us-gaap_AmortizationOfIntangibleAssets	482us-gaap_AmortizationOfIntangibleAssets	4,643us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation expense	18,305us-gaap_ShareBasedCompensation	17,021us-gaap_ShareBasedCompensation	25,525us-gaap_ShareBasedCompensation
Veloce acquisition consideration	9,230	42,684	66,188
Acquisition related adjustment	0amcc_AcquisitionRelatedAdjustment	0amcc_AcquisitionRelatedAdjustment	(133)amcc_AcquisitionRelatedAdjustment
Gain on sale of TPack	0	(19,699)	0
Gain on sale of building	0	(25,815)	0
Gain on short-term Investments and other, net	1,317	3,383	2,684
Impairment of strategic investments	3,000	0	2,250
Tax effect on other comprehensive loss	126us-gaap_OtherComprehensiveIncomeLossTax	(40)us-gaap_OtherComprehensiveIncomeLossTax	(989)us-gaap_OtherComprehensiveIncomeLossTax
Non-cash restructuring charges	2,615us-gaap_RestructuringCosts	298us-gaap_RestructuringCosts	4,719us-gaap_RestructuringCosts
Impairment of short-term investments and marketable securities	0us-gaap_ImpairmentOfInvestments	0us-gaap_ImpairmentOfInvestments	1,143us-gaap_ImpairmentOfInvestments
Impairment of notes receivable and other assets	0us-gaap_OtherAssetImpairmentCharges	0us-gaap_OtherAssetImpairmentCharges	1,800us-gaap_OtherAssetImpairmentCharges
Changes in operating assets and liabilities:
Accounts receivable, net	12,771	(837)	(1,909)
Inventories, net	(4,573)us-gaap_IncreaseDecreaseInInventories	(6,049)us-gaap_IncreaseDecreaseInInventories	10,344us-gaap_IncreaseDecreaseInInventories
Other assets	(1,440)	3,232	(2,871)
Accounts payable	(9,911)	5,778	(622)
Accrued payroll and other liabilities	(3,127)	(671)	(82)
Veloce accrued liability	(9,150)	(63,657)	(16,537)
Deferred revenue	(152)	(770)	(668)
Net cash used for operating activities	(27,022)	(46,847)	(34,456)
Investing activities:
Proceeds from sales and maturities of short-term investments	16,340	47,810	43,555
Purchases of short-term investments	(19,887)	(18,081)	(21,633)
Proceeds from sale of property and equipment	1	70	1,800
Purchase of property and equipment	(9,772)	(5,952)	(9,045)
Proceeds from sale of strategic investment	0	1,286	7,146
Proceeds from the sale of TPack, net	3,353	29,498	0
Proceeds from sale of building	0us-gaap_ProceedsFromSaleOfBuildings	40,176us-gaap_ProceedsFromSaleOfBuildings	0us-gaap_ProceedsFromSaleOfBuildings
Purchases of strategic investment	0	0	(500)
Net cash (used for) provided by investing activities	(9,965)	94,807	21,323
Financing activities:
Proceeds from issuance of common stock	3,854	11,619	8,873
Funding of restricted stock units withheld for taxes	(1,911)	(6,550)	(3,121)
Repurchase of common stock	0	0	(653)
Payment of contingent consideration	0amcc_PaymentOfContingentConsideration	0amcc_PaymentOfContingentConsideration	(485)amcc_PaymentOfContingentConsideration
Other	0	(555)	(481)
Net cash provided by financing activities	1,943	4,514	4,133
Net (decrease) increase in cash and cash equivalents	(35,044)	52,474	(9,000)
Cash and cash equivalents at beginning of year	71,539	19,065	28,065
Cash and cash equivalents at end of year	36,495	71,539	19,065
Supplementary cash flow disclosures:
Cash paid for income taxes	732us-gaap_IncomeTaxesPaidNet	870us-gaap_IncomeTaxesPaidNet	987us-gaap_IncomeTaxesPaidNet
Reclassification adjustment from AOCI for sale of securities, Net of tax	$ (1,353)	$ (3,360)	$ (1,391)

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The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the additional capital contribution to the entity.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash inflow from sale of buildings.

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The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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