Restructuring and Related Charges (Schedule of Restructuring Charges Incurred Cumulative to Date) (Details) $ in Millions	Dec. 29, 2017 USD ($)
2013 Mallinckrodt program
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	$ 124.7
2013 Mallinckrodt program | Specialty Brands [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	18.8
2013 Mallinckrodt program | Specialty Generics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	18.3
2013 Mallinckrodt program | Nuclear Imaging
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	69.9
2013 Mallinckrodt program | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	17.7
2016 Mallinckrodt Program
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	50.6
2016 Mallinckrodt Program | Specialty Brands [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	32.5
2016 Mallinckrodt Program | Specialty Generics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	9.1
2016 Mallinckrodt Program | Nuclear Imaging
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	0.0
2016 Mallinckrodt Program | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred cumulative to date	$ 9.0