| Document and Entity Information | Feb. 10, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001596783 |
| Document Type | 8-K |
| Document Period End Date | Feb. 10, 2021 |
| Entity Registrant Name | CATALENT, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36587 |
| Entity Tax Identification Number | 20-8737688 |
| Entity Address, Address Line One | 14 Schoolhouse Road |
| Entity Address, City or Town | Somerset |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08873 |
| City Area Code | (732) |
| Local Phone Number | 537-6200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value per share |
| Trading Symbol | CTLT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
