| Document and Entity Information Document and Entity Information | Apr. 29, 2020 |
| Document & Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 29, 2020 |
| 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 |
