| Document and Entity Information Document and Entity Information | Oct. 12, 2021 | Apr. 22, 2020 |
| Document & Entity Information [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Oct. 12, 2021 | |
| Entity Registrant Name | AZZ Inc. | |
| Entity Incorporation, State or Country Code | TX | |
| Entity File Number | 1-12777 | |
| Entity Tax Identification Number | 75-0948250 | |
| Entity Address, Address Line One | One Museum Place, Suite 500 | |
| Entity Address, Address Line Two | 3100 West 7th Street | |
| Entity Address, City or Town | Fort Worth | |
| Entity Address, State or Province | TX | |
| Entity Address, Postal Zip Code | 76107 | |
| City Area Code | 817 | |
| Local Phone Number | 810-0095 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common Stock | |
| Trading Symbol | AZZ | |
| Security Exchange Name | NYSE | |
| Entity Emerging Growth Company | false | |
| Entity Central Index Key | 0000008947 | |
| Amendment Flag | false |
