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BALANCE SHEET DETAILS (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Outstanding note payable	$ 3.6	$ 1.9
Outstanding note payable included in other long-term liabilities	2.9us-gaap_DueToAffiliateNoncurrent	1.6us-gaap_DueToAffiliateNoncurrent
Outstanding note payable included in accounts payable	0.7us-gaap_DueToAffiliateCurrent	0.3us-gaap_DueToAffiliateCurrent
Payment to equity method investee relating to a cost sharing arrangement for facility services	6.7	6.8
Other	21.0atml_Paymentforwafer
interest expense related to MSA	$ 0.3atml_InterestexpenserelatedtoMSA

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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- Definition

Amount of receivables owed to an entity that is affiliated with the reporting entity by means of direct or indirect ownership, which are usually due after one year (or one business cycle, if longer).

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