Document and Entity Information - shares	9 Months Ended
	Dec. 30, 2017	Feb. 01, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Entity Registrant Name	CIRRUS LOGIC INC
Entity Central Index Key	0000772406
Entity Filer Category	Large Accelerated Filer
Document Period End Date	Dec. 30, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--03-31
Entity Common Stock, Shares Outstanding		63,366,331