Represents the number of customers with concentration risk accounting for more than 10 percent of revenue, for the entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation.

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- Definition

Represents the number of distributors with concentration risk, for the entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation.

+ Details

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division of distributor one.

+ Details

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Period Type:	instant

- Definition

+ Details

Name:	atml_ConcentrationRiskPercentageDistributorThree
Namespace Prefix:	atml
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

+ Details

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- 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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13531-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

+ Details

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OPERATING AND GEOGRAPHICAL SEGMENTS (Details 3)	3 Months Ended
OPERATING AND GEOGRAPHICAL SEGMENTS (Details 3)	Sep. 30, 2011 Y customer	Sep. 30, 2011 Net revenues	Sep. 30, 2010 Net revenues	Sep. 30, 2011 Accounts receivable Distributor	Dec. 31, 2010 Accounts receivable Distributor
Concentration risk
Number of customers accounting for more than 10% revenue	1
Percentage of concentration risk		10.00%	10.00%
Number of distributors with concentration risk				3	2
Percentage of concentration risk of distributor one				16.00%	14.00%
Percentage of concentration risk of distributor two				11.00%	12.00%
Percentage of concentration risk of distributor three				11.00%