Common Shares and Net (Loss) Income per Common Share - Reconciliation of Numerator and Denominators of Basic and Diluted Net (Loss) Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Numerator (in millions):
Net (loss) income attributable to Cott Corporation Continuing operations									$ (3.6)	$ (60.3)	$ (2.2)
Net (loss) income attributable to Cott Corporation - Discontinued operations									2.2	(17.5)	(1.2)
Net income (loss) attributable to Cott Corporation									$ (1.4)	$ (77.8)	$ (3.4)
Weighted average common shares outstanding - basic									139,078	128,290	103,037
Continuing operations	$ 0.07	$ 0.01	$ (0.03)	$ (0.07)	$ (0.40)	$ (0.03)	$ (0.02)	$ 0.01	$ (0.03)	$ (0.47)	$ (0.02)
Discontinued operations	0.05	0.29	(0.15)	(0.19)	(0.18)	0.01	0.08	(0.03)	0.02	(0.14)	(0.01)
Net losses	0.12	0.30	(0.18)	(0.26)	(0.58)	(0.02)	0.06	(0.02)	$ (0.01)	$ (0.61)	$ (0.03)
Denominator (in thousands):
Weighted average common shares outstanding - basic									139,078	128,290	103,037
Weighted average common shares outstanding - diluted									139,078	128,290	103,037
Diluted Earnings Per Share:
Continued operations	0.07	0.01	(0.03)	(0.07)	(0.40)	(0.03)	(0.02)	0.01	$ (0.03)	$ (0.47)	$ (0.02)
Discontinued operations	0.05	0.29	(0.15)	(0.19)	(0.18)	0.01	0.08	(0.03)	0.02	(0.14)	(0.01)
Net losses	$ 0.12	$ 0.30	$ (0.18)	$ (0.26)	$ (0.58)	$ (0.02)	$ 0.06	$ (0.02)	$ (0.01)	$ (0.61)	$ (0.03)
Performance-Based RSUs [Member]
Denominator (in thousands):
Dilutive effect of awards									0	0	0
Time-Based RSUs [Member]
Denominator (in thousands):
Dilutive effect of awards									0	0	0
Stock Options [Member]
Denominator (in thousands):
Dilutive effect of awards									0	0	0