Earnings Per Share and Shareholders Equity (Details) - USD ($)		3 Months Ended
		Apr. 02, 2016	Mar. 28, 2015	Oct. 31, 2015
Numerator:
Net loss		$ (529,200,000)	$ (22,200,000)
Denominator:
Weighted average shares outstanding for basic EPS (in shares)		143,200,000	140,800,000
Dilutive effect of share-based awards (in shares)	[1]	0	0
Weighted average shares outstanding for diluted EPS (in shares)		143,200,000	140,800,000
Anti-dilutive share-based awards excluded from computation of diluted EPS (in shares)		0	0
Share issued related to the exercise and vesting of share-based compensation (in shares)		79,000	35,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining authorized repurchase amount		$ 1,500,000,000
Share repurchased (in shares)		0
Perrigo Co PLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized amount of share repurchase (up to)				$ 2,000,000,000

[1] In the period of a net loss, diluted shares equal basic shares.