Document and Entity Information - shares	6 Months Ended
	Sep. 29, 2018	Oct. 26, 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	Sep. 29, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--03-30
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		59,844,299