Commitments and Contingencies (Narrative) (Details)				6 Months Ended			12 Months Ended
	Feb. 01, 2020 USD ($)	Jun. 30, 2018 Defendent	May 01, 2007 Defendent	Dec. 30, 2022 USD ($)		Jun. 16, 2022 USD ($)	Dec. 31, 2021 USD ($)		Dec. 25, 2020 USD ($)		Sep. 28, 2021 USD ($)	Jun. 28, 2019 USD ($)	Aug. 07, 2018 USD ($)	Apr. 11, 2014 USD ($)
Loss Contingencies [Line Items]
Environmental liabilities				$ 36,900,000
Medicaid lawsuit charge									$ (536,000,000.0)
Liabilities subject to compromise				0			$ 6,397,700,000
Environmental liabilities				35,800,000			43,000,000.0
Sales [Member]
Loss Contingencies [Line Items]
Medicaid lawsuit charge				0	[1]	$ 0	0	[1]	$ (536,000,000.0)	[1]
Occidental, Lower Passaic River [Member]
Loss Contingencies [Line Items]
Number of defendants | Defendent		120
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Environmental liabilities				21,000,000
Loss Contingency, Settlement Agreement, Amount													$ 280,600
Remedial cost, estimate												$ 1,380,000,000		$ 1,700,000,000
Marietta, GA Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 2,000,000
Upper 9 Miles, Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate											$ 441,000,000
Other current liabilities
Loss Contingencies [Line Items]
Environmental liabilities, current				1,100,000
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Number of defendants | Defendent			70
Minimum
Loss Contingencies [Line Items]
Remedial cost, estimate				18,400,000
Minimum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate														365,000,000
Maximum
Loss Contingencies [Line Items]
Remedial cost, estimate				48,500,000
Maximum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate														$ 3,200,000,000
Maximum | Medicaid Lawsuit [Member]
Loss Contingencies [Line Items]
Remedial cost, estimate						$ 640,000,000
Fair Value, Measurements, Recurring
Loss Contingencies [Line Items]
Contingent consideration				7,300,000			27,300,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Loss Contingencies [Line Items]
Contingent consideration				$ 7,300,000			27,300,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Stratatech [Member]
Loss Contingencies [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability							$ 27,300,000

[1] Specialty Brands net sales for fiscal 2020 (Predecessor) includes the prospective change to the Medicaid rebate calculation, which served to reduce Acthar Gel net sales by $40.4 million for the period from June 15, 2020 through December 25, 2020 (Predecessor).