Document And Entity Information	6 Months Ended
	Mar. 28, 2014	May 02, 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	Mar. 28, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Amendment Flag	false
Ordinary Shares Outstanding		58,477,170