Document and Entity Information - shares	3 Months Ended
	Sep. 30, 2017	Nov. 03, 2017
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Entity Registrant Name	Catalent, Inc.
Entity Central Index Key	0001596783
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding (shares)		132,859,522