Goodwill - Rollforward (Detail) - USD ($) $ in Millions	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Goodwill [Roll Forward]
Beginning balance			$ 3,006.0				$ 3,006.0		$ 3,006.0
Goodwill, Acquired During Period									216.0
Goodwill, Transfers									0.0
Foreign currency translation adjustments									11.0
Ending balance	$ 3,023.0								$ 3,023.0		$ 3,006.0
Goodwill Input, Discount Rate Minimum, Percentage	10.50%								10.50%
Net revenue	$ 1,037.0		1,015.0	$ 1,273.0					$ 3,208.0	$ 3,515.0	4,802.0
Inter-segment revenue elimination	$ (1.0)	$ (1.0)	0.0	(1.0)	$ (1.0)	$ (1.0)	(1.0)	$ (2.0)	$ (2.0)	(3.0)
Goodwill Inputs Long Term Revenue Growth Rate, Percentage	3.00%								3.00%
Goodwill Input, Discount Rate Minimum, Percentage	10.50%								10.50%
Goodwill Input Discount Rate Minimum, Percentage	9.00%								9.00%
Goodwill, Impairment Loss	$ (210.0)			0.0					$ (210.0)	0.0
Biologics
Goodwill [Roll Forward]
Beginning balance			1,535.0				1,535.0		1,535.0
Goodwill, Acquired During Period									0.0
Goodwill, Transfers									16.0
Foreign currency translation adjustments									7.0
Ending balance	1,558.0								1,558.0		1,535.0
Net revenue	475.0			700.0					1,578.0	1,889.0
Biologics | Manufacturing & Commercial Product Supply
Goodwill [Roll Forward]
Net revenue	133.0			200.0					303.0	503.0
Biologics | Development Services
Goodwill [Roll Forward]
Net revenue	342.0			500.0					1,275.0	1,386.0
PharmaConsumerHealth
Goodwill [Roll Forward]
Beginning balance			$ 1,471.0				$ 1,471.0		1,471.0
Goodwill, Acquired During Period									216.0
Goodwill, Transfers									(16.0)
Foreign currency translation adjustments									4.0
Ending balance	1,465.0								1,465.0		$ 1,471.0
Net revenue	563.0			574.0					1,632.0	1,629.0
Goodwill, Impairment Loss	(210.0)			0.0					(210.0)	0.0
PharmaConsumerHealth | Manufacturing & Commercial Product Supply
Goodwill [Roll Forward]
Net revenue	349.0			368.0					1,027.0	1,042.0
PharmaConsumerHealth | Development Services
Goodwill [Roll Forward]
Net revenue	214.0			206.0					605.0	587.0
Total Catalent before inter-segment revenue elimination
Goodwill [Roll Forward]
Net revenue	1,038.0			1,274.0					3,210.0	3,518.0
Total Catalent before inter-segment revenue elimination | Manufacturing & Commercial Product Supply
Goodwill [Roll Forward]
Net revenue	482.0			568.0					1,330.0	1,545.0
Total Catalent before inter-segment revenue elimination | Development Services
Goodwill [Roll Forward]
Net revenue	$ 556.0			$ 706.0					$ 1,880.0	$ 1,973.0