| Document and Entity Information | Nov. 20, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Nov. 20, 2019 |
| Entity Registrant Name | LA-Z-BOY INCORPORATED |
| Entity Incorporation, State or Country Code | MI |
| Entity File Number | 1-9656 |
| Entity Tax Identification Number | 38-0751137 |
| Entity Address, Address Line One | One La-Z-Boy Drive, |
| Entity Address, City or Town | Monroe, |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 48162-5138 |
| City Area Code | 734 |
| Local Phone Number | 242-1444 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $1.00 par value |
| Trading Symbol | LZB |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000057131 |
| Amendment Flag | false |
