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Subsequent Event (Additional Information) (Detail) (Common Stock, CAD)	Oct. 31, 2012
Common Stock
Subsequent Event [Line Items]
Dividend per Common share	0.06

X

- Definition

Common Stock Dividend Per Share Declared

+ References

No definition available.

+ Details

Name:	cot_CommonStockDividendPerShareDeclared
Namespace Prefix:	cot_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration