| Document and Entity Information Document | Jul. 26, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 26, 2023 |
| Entity Registrant Name | Astec Industries, Inc. |
| Entity Central Index Key | 0000792987 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | TN |
| Entity File Number | 001-11595 |
| Entity Tax Identification Number | 62-0873631 |
| Entity Address, Address Line One | 1725 Shepherd Road, |
| Entity Address, City or Town | Chattanooga |
| Entity Address, State or Province | TN |
| Entity Address, Postal Zip Code | 37421 |
| City Area Code | 423 |
| Local Phone Number | 899-5898 |
| 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 | ASTE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
