Quarterly Financial Information (Unaudited) - Schedule of Quarterly Financial Information (Unaudited) (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jan. 02, 2016	Jan. 03, 2015
Quarterly Financial Information Disclosure [Abstract]
Decrease to cost of sales	$ 4.8	$ 0.2
Decrease to SG&A expenses	0.2	0.1
Decrease in income tax benefit	$ 1.9	$ 0.1

Decrease to selling general and administrative expenses.

No definition available.

Name:	cot_DecreaseToSellingGeneralAndAdministrativeExpenses
Namespace Prefix:	cot_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration