Document And Entity Information	3 Months Ended
	Dec. 27, 2013	Jan. 31, 2014
Document And Entity Information [Abstract]
Entity Registrant Name	Mallinckrodt plc
Entity Central Index Key	0001567892
Trading Symbol	MNK
Current Fiscal Year End Date	--09-26
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Dec. 27, 2013
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Amendment Flag	false
Ordinary Shares Outstanding		58,169,085