Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cot_MountainValleyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cot_CrystalRockAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Components of Identified Intangible Assets (Detail) - USD ($) $ in Millions	Oct. 15, 2018	Mar. 21, 2018	Dec. 28, 2019	Dec. 29, 2018
Mountain Valley
Business Acquisition [Line Items]
Estimated Fair Market Value	$ 25.8		$ 28.4
Mountain Valley \| Valuation, Income Approach \| Estimate of Fair Value Measurement
Business Acquisition [Line Items]
Estimated Fair Market Value	28.4
Mountain Valley \| Trademarks and trade names \| Valuation, Income Approach \| Estimate of Fair Value Measurement
Business Acquisition [Line Items]
Estimated Fair Market Value	$ 18.4
Mountain Valley \| Customer relationships
Business Acquisition [Line Items]
Weighted average estimated useful life (in years)	20 years
Mountain Valley \| Customer relationships \| Valuation, Income Approach \| Estimate of Fair Value Measurement
Business Acquisition [Line Items]
Estimated Fair Market Value				$ 10.0
Crystal rock acquisition
Business Acquisition [Line Items]
Estimated Fair Market Value		$ 12.6	$ 12.6
Crystal rock acquisition \| Valuation, Income Approach \| Estimate of Fair Value Measurement
Business Acquisition [Line Items]
Estimated Fair Market Value		12.6
Crystal rock acquisition \| Trademarks and trade names \| Valuation, Income Approach \| Estimate of Fair Value Measurement
Business Acquisition [Line Items]
Estimated Fair Market Value		$ 4.2
Crystal rock acquisition \| Customer relationships
Business Acquisition [Line Items]
Weighted average estimated useful life (in years)		11 years
Crystal rock acquisition \| Customer relationships \| Valuation, Income Approach \| Estimate of Fair Value Measurement
Business Acquisition [Line Items]
Estimated Fair Market Value				$ 8.4