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Commitments and Contingencies (Narrative) (Details)			3 Months Ended		12 Months Ended
Commitments and Contingencies (Narrative) (Details)	Feb. 25, 2020 USD ($) $ / shares	Mar. 19, 2014 USD ($)	Mar. 27, 2020 USD ($) lawsuit Case	Dec. 27, 2019 USD ($)	Dec. 27, 2019 USD ($)	Sep. 26, 2014 USD ($)
Loss Contingencies [Line Items]
Environmental liabilities			$ 61,900,000
Interest Payable, Installment Sales			47,400,000	$ 47,400,000	$ 47,400,000
Operating Loss Carryforwards			$ 765,100,000
Asbestos Matters
Loss Contingencies [Line Items]
Pending claims \| Case			11,800
Estimation of liability, historical term			5 years
Estimation of liability, expected future term of claims			7 years
Accrued and other current liabilities
Loss Contingencies [Line Items]
Environmental liabilities, current			$ 1,300,000
Minimum \| Environmental Remediation
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			38,200,000
Maximum \| Environmental Remediation
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			87,000,000.0
Questcor Subpoena [Member]
Loss Contingencies [Line Items]
Payments for Legal Settlements					15,400,000
Boston Civil Investigative Demand [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual			0
Boston Civil Investigative Demand [Member] \| Maximum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			1,280,000,000.0
Medicaid Lawsuit [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual			0
Medicaid Lawsuit [Member] \| Maximum \| Retroactive [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			640,000,000.0
Track 1 Cases [Member]
Loss Contingencies [Line Items]
Payments for Legal Settlements				24,000,000.0
Loss Contingency Accrual, Product Liability, Gross			6,000,000.0
Loss Contingency, Accrual, Noncurrent			$ 500,000
Opioid crisis [Member] \| Cities, Counties, and/or Other Government-related Persons/Entities [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs \| lawsuit			2,531
Opioid crisis [Member] \| Hospitals, Health Systems, Unions, Health and Welfare Fund or Third-Party Payers [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs \| lawsuit			261
Opioid crisis [Member] \| Individuals [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs \| lawsuit			116
Opioid crisis [Member] \| Schools and School Boards [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs \| lawsuit			7
Opioid crisis [Member] \| State Attorney Generals [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs \| lawsuit			17
Opioid crisis [Member] \| U.S. States [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs \| lawsuit			231
Opioid Claimant Trust [Member]
Loss Contingencies [Line Items]
Warrant, Exercise Price \| $ / shares	$ 3.15
Litigation Settlement, Amount Awarded to Other Party, Settlement Closing Amount	$ 300,000,000.0
Litigation Settlement, Amount Awarded to Other Party, Post Closing Settlement Amount, Total	1,300,000,000.0
Litigation Settlement, Amount Awarded to Other Party, Post Closing Settlement Amount, Year One & Two	200,000,000.0
Litigation Settlement, Amount Awarded to Other Party, Post Closing Settlement Amount, Year Three through Eight	$ 150,000,000.0
Opioid Claimant Trust [Member] \| Maximum
Loss Contingencies [Line Items]
Acquisition of Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners, Quarterly Limit	5.00%
Loss Contingency Accrual				$ 1,600,000,000.0	1,600,000,000.0
Warrant Expense, Opioid-related Settlement			$ 26,600,000		$ 43,400,000
New York State Department of Financial Services [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			5,000
Acthar \| Medicaid Lawsuit [Member] \| Minimum \| Prospective [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			90,000,000.0
Acthar \| Medicaid Lawsuit [Member] \| Maximum \| Prospective [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			100,000,000.0
Acthar \| Humana Inc. [Member]
Loss Contingencies [Line Items]
Proceeds from Customers			$ 700,000,000.0
Cadence Pharmaceuticals, Inc. [Member]
Loss Contingencies [Line Items]
Business Combination, Consideration Transferred		$ 1,329,000,000.0
Internal Revenue Service (IRS) [Member] \| Cadence Pharmaceuticals, Inc. [Member]
Loss Contingencies [Line Items]
Proposed Adjustment to Taxable Income						$ 871,000,000.0
Senior Notes \| 4.88% Senior Notes
Loss Contingencies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.875%
Senior Notes \| 5.75% Senior Notes
Loss Contingencies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.75%
Senior Notes \| 10.00% Second Lien Senior Notes
Loss Contingencies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			10.00%
Other Ownership Interest [Member] \| Opioid Claimant Trust [Member] \| Maximum
Loss Contingencies [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	19.99%