| Cover | Jan. 06, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 6, 2022 |
| Entity File Number | 001-32046 |
| Entity Registrant Name | Simulations Plus, Inc. |
| Entity Central Index Key | 0001023459 |
| Entity Tax Identification Number | 95-4595609 |
| Entity Incorporation, State or Country Code | CA |
| Entity Address, Address Line One | 42505 10th Street West, |
| Entity Address, City or Town | Lancaster |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 93534-7059 |
| City Area Code | 661 |
| Local Phone Number | 723-7723 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | SLP |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
