INVENTORIES, Fair Value Step-Up in Basis (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]
Inventory, step up adjustment	$ 10.5
Cost of goods sold inventory step-up, amortization	$ 9.1

The amount of expense recognized in the current period that reflects the allocation of the costs of fair value step-up in inventory over the expected benefit period of such assets. This element applies only to the fair value step-up in inventory used in the production of goods.

No definition available.

Name:	affx_CostOfGoodsSoldInventoryStep-UpAmortization
Namespace Prefix:	affx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration