Document And Entity Information	6 Months Ended
	Dec. 28, 2014	Jan. 23, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	LINEAR TECHNOLOGY CORP /CA/
Entity Central Index Key	0000791907
Current Fiscal Year End Date	--06-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Dec. 28, 2014
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		239,194,328