| Document And Entity Information | May 18, 2020 |
| Document Information [Line Items] | |
| Entity, Registrant Name | BIO-TECHNE CORPORATION |
| Document, Type | 8-K |
| Document, Period End Date | May 18, 2020 |
| Entity, Incorporation, State or Country Code | MN |
| Entity, File Number | 0-17272 |
| Entity, Tax Identification Number | 41-1427402 |
| Entity, Address, Address Line One | 614 McKinley Place NE |
| Entity, Address, City or Town | Minneapolis |
| Entity, Address, State or Province | MN |
| Entity, Address, Postal Zip Code | 55413 |
| City Area Code | 612 |
| Local Phone Number | 379-8854 |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | TECH |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000842023 |
