Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2016	Jan. 31, 2017
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
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)		124,776,012