Other Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Assumption of earnout liability from the Partnership	$ 36.0	$ 0.0
Partnership units issued and value contributed to Patheon from acquisition	0.0	34.1
Irix
Condensed Cash Flow Statements, Captions [Line Items]
Partnership units issued and value contributed to Patheon from acquisition	0.0	1.0
Agere
Condensed Cash Flow Statements, Captions [Line Items]
Partnership units issued and value contributed to Patheon from acquisition	0.0	6.8
Note Payable to DSM Newco B.V.
Condensed Cash Flow Statements, Captions [Line Items]
Assumption of earnout liability from the Partnership	$ 51.0	$ 0.0