| Cover Page | Aug. 18, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 18, 2020 |
| Entity Central Index Key | 0000779152 |
| Entity Registrant Name | HENRY JACK & ASSOCIATES INC |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 0-14112 |
| Entity Tax Identification Number | 43-1128385 |
| Entity Address, Address Line One | 663 Highway 60, P.O. Box 807 |
| Entity Address, City or Town | Monett |
| Entity Address, State or Province | MO |
| Entity Address, Postal Zip Code | 65708 |
| City Area Code | 417 |
| Local Phone Number | 235-6652 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Document Fiscal Year Focus | 2020 |
| Document Fiscal Period Focus | FY |
