| Document and Entity Information | Jun. 25, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001118417 |
| Current Fiscal Year End Date | --09-30 |
| Document Type | 8-K |
| Document Period End Date | Jun. 25, 2024 |
| Entity Registrant Name | MODEL N, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-35840 |
| Entity Tax Identification Number | 77-0528806 |
| Entity Address, Address Line One | 777 Mariners Island Boulevard |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | San Mateo |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94404 |
| City Area Code | (650) |
| Local Phone Number | 610-4600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.00015 per share |
| Trading Symbol | MODN |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
