Net (Loss) Income per Common Share - Reconciliation of Numerator and Denominators of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net (loss) income attributed to Cott Corporation	$ (4.4)	$ 4.8	$ 2.2	$ (6.0)	$ 18.7	$ 1.3	$ (5.9)	$ (4.1)	$ (3.4)	$ 10.0	$ 17.0
Accumulated dividends on convertible preferred shares										0.6
Diluted net (loss) income attributed to Cott Corporation									$ (3.4)	$ 10.6	$ 17.0
Weighted average number of shares outstanding - basic									103,037	93,777	94,750
Adjusted weighted average number of shares outstanding - diluted									103,037	95,900	95,633
Performance-Based RSUs [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of awards										325	303
Time-Based RSUs [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of awards										619	525
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of awards										83	55
Convertible Preferred Shares [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of awards										1,096