| Document and Entity Information | Jan. 27, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 27, 2020 |
| Entity Registrant Name | CIRRUS LOGIC INC |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 000-17795 |
| Entity Tax Identification Number | 77-0024818 |
| Entity Address, Address Line One | 800 W. 6th Street |
| Entity Address, City or Town | Austin |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 78701 |
| City Area Code | 512 |
| Local Phone Number | 851-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000772406 |
| Title of 12(g) Security | Common stock, $0.001 par value |
| Trading Symbol | CRUS |
| Security Exchange Name | NASDAQ |
| Current Fiscal Year End Date | --03-28 |
