| Document Information | May 04, 2021 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Entity Registrant Name | CATALENT, INC. |
| Trading Symbol | CTLT |
| Local Phone Number | 537-6200 |
| City Area Code | (732) |
| Entity Address, Postal Zip Code | 08873 |
| Entity Address, State or Province | NJ |
| Entity Address, Address Line One | 14 Schoolhouse Road |
| Entity Address, City or Town | Somerset, |
| Amendment Flag | false |
| Entity Tax Identification Number | 20-8737688 |
| Entity Central Index Key | 0001596783 |
| Entity File Number | 001-36587 |
| Document Period End Date | May 4, 2021 |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Entity Incorporation, State or Country Code | DE |
| Soliciting Material | false |
| Pre-commencement Issuer Tender Offer | false |
| Pre-commencement Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Security Exchange Name | NYSE |
