| Cover Page | Oct. 30, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Oct. 30, 2019 |
| Entity Registrant Name | ASPEN TECHNOLOGY, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-34630 |
| Entity Tax Identification Number | 04-2739697 |
| Entity Address, Address Line One | 20 Crosby Drive, |
| Entity Address, City or Town | Bedford, |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01730 |
| City Area Code | 781 |
| Local Phone Number | 221-6400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, $0.10 par value per share |
| Trading Symbol | AZPN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000929940 |
| Amendment Flag | false |
