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 Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net (loss) income attributed to Cott Corporation	$ (79.8)	$ (2.6)	$ 7.4	$ (2.8)	$ (4.4)	$ 4.8	$ 2.2	$ (6.0)	$ (77.8)	$ (3.4)	$ 10.0
Accumulated dividends on Convertible Preferred Shares											0.6
Diluted net (loss) income attributed to Cott Corporation									$ (77.8)	$ (3.4)	$ 10.6
Weighted average number of shares outstanding-basic									128,290	103,037	93,777
Adjusted weighted average number of shares outstanding-diluted									128,290	103,037	95,900
Performance-Based RSUs [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of awards											325
Time-Based RSUs [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of awards											619
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of awards											83
Convertible Preferred Shares [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of awards											1,096