Document and Entity Information	3 Months Ended
	Mar. 31, 2013
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Trading Symbol	FCS
Entity Registrant Name	FAIRCHILD SEMICONDUCTOR INTERNATIONAL INC
Entity Central Index Key	0001036960
Current Fiscal Year End Date	--12-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	127,216,297