Name:	atml_DisposalGroupIncludingDiscontinuedOperationOtherCostsExcludingTransferFeeOnDispositionOfAssets
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the performance-based bonuses paid to certain employees other than executive officers related to the completion of the sale of manufacturing operations.

No definition available.

Name:	atml_DisposalGroupIncludingDiscontinuedOperationPerformanceBasedBonusesOnDispositionOfAssets
Namespace Prefix:	atml_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The sale price associated from the sale of a portion of the Company's business, for example a segment, division, branch or other business, during the period.

No definition available.

Name:	atml_DisposalGroupIncludingDiscontinuedOperationSalesPrice
Namespace Prefix:	atml_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents selling costs incurred by the entity related to the sale of manufacturing operations.

No definition available.

Name:	atml_DisposalGroupIncludingDiscontinuedOperationSellingCostsOnDispositionOfAssets
Namespace Prefix:	atml_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the transfer fee incurred by the entity related to the sale of manufacturing operations.

No definition available.

Name:	atml_DisposalGroupIncludingDiscontinuedOperationTransferFeeOnDispositionOfAssets
Namespace Prefix:	atml_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

In a transaction not treated as a divestiture for accounting purposes and in which the disposed operation is not consolidated for accounting purposes, the aggregate amount of the disposed assets that are segregated in the balance sheet.

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section E

-Paragraph Question 2

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

Amount of foreign currency translation gains or losses included in the disposal group, whether or not a component of the entity (discontinued operation), that were previously reported in accumulated other comprehensive Income or Loss.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLosses
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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The gains (losses) included in earnings resulting from the sale or disposal of tangible assets. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 47

-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 FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760