Document and Entity Information - shares	9 Months Ended
	Mar. 31, 2020	May 01, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-36587
Entity Registrant Name	Catalent, Inc.
Entity Incorporation, State or Country Code	DE
Entity Address, State or Province	NJ
Entity Tax Identification Number	20-8737688
Entity Address, Address Line One	14 Schoolhouse Road,
Entity Address, City or Town	Somerset,
Entity Address, Postal Zip Code	08873
City Area Code	(732)
Local Phone Number	537-6200
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	CTLT
Security Exchange Name	NYSE
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001596783
Current Fiscal Year End Date	--06-30
Entity Common Stock, Shares Outstanding (shares)		154,897,515