Debt Instrument, Basis Spread On Variable Rate, Floor

No definition available.

Name:	cnr_DebtInstrumentBasisSpreadOnVariableRateFloor
Namespace Prefix:	cnr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

+ Details

Name:	cnr_LineOfCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix:	cnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
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.

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+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=cnr_ABLFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cnr_ABLFILOFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	cnr_DebtCovenantTermsAxis=cnr_CommitmentFeePercentageOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - ABL Facility due May 2029 (Details) - USD ($)	May 15, 2024	Apr. 12, 2018
ABL Facility \| Minimum \| Line of Credit
Debt Instrument [Line Items]
Unused commitment fee	0.25%
ABL Facility \| Secured Overnight Financing Rate (SOFR) \| Line of Credit
Debt Instrument [Line Items]
Spread on variable rate, floor	0.00%
ABL Facility \| Secured Overnight Financing Rate (SOFR) \| Minimum \| Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
ABL Facility \| Secured Overnight Financing Rate (SOFR) \| Maximum \| Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
ABL Facility \| Base Rate \| Minimum \| Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate	0.25%
ABL Facility \| Base Rate \| Maximum \| Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%
ABL FILO Facility \| Minimum \| Commitment Fee Percentage One
Debt Instrument [Line Items]
Unused commitment fee		0.25%
ABL FILO Facility \| Secured Overnight Financing Rate (SOFR) \| Line of Credit
Debt Instrument [Line Items]
Spread on variable rate, floor		0.00%
ABL FILO Facility \| Secured Overnight Financing Rate (SOFR) \| Minimum \| Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
ABL FILO Facility \| Secured Overnight Financing Rate (SOFR) \| Maximum \| Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		2.75%
ABL FILO Facility \| Base Rate \| Minimum \| Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%
ABL FILO Facility \| Base Rate \| Maximum \| Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Revolving Credit Facility \| ABL Facility \| Line of Credit
Debt Instrument [Line Items]
Authorized	$ 945,000,000.0	$ 850,000,000.0
Revolving Credit Facility \| ABL FILO Facility \| Line of Credit
Debt Instrument [Line Items]
Accordion feature, increase limit		$ 95,000,000.0