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Lease Commitments - Narrative (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Leases [Abstract]
Carrying amount of capital leases	$ 167,500
Net book value of capital leases	148,000
Principal
2018	4,553
2019	7,464
2020	6,758
2021	4,446
2022	3,782
Thereafter	128,309
Total	155,312
Interest
2018	7,244
2019	13,801
2020	13,425
2021	13,129
2022	12,923
Thereafter	182,819
Total	$ 243,341

X

- Definition

Represents amount of minimum lease interest payments for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumInterestPaymentsDue
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease interest payments maturing in the next fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease Interest payments maturing in the fifth fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease Interest payments maturing in the forth fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease payments maturing after the fifth fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease Interest payments maturing in the third fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease Interest payments maturing in the second fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease principal payments for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease principal payments maturing in the next fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease principal payments maturing in the fifth fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease principal payments maturing in the forth fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease payments maturing after the fifth fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease principal payments maturing in the third fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents amount of minimum lease principal payments maturing in the second fiscal year following the latest fiscal year for capital leases.

+ References

No definition available.

+ Details

Name:	bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents carrying amount of capital leases related to trucks and trailers.

+ References

No definition available.

+ Details

Name:	bxc_CarryingAmountOfCapitalLeases
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Interest Payments on Capital Leases [Abstract]

+ References

No definition available.

+ Details

Name:	bxc_InterestPaymentsonCapitalLeasesAbstract
Namespace Prefix:	bxc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents net book value of capital leases related to trucks and trailers.

+ References

No definition available.

+ Details

Name:	bxc_NetBookValueOfCapitalLeases
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Principal Payments on Capital Leases [Abstract]

+ References

No definition available.

+ Details

Name:	bxc_PrincipalPaymentsonCapitalLeasesAbstract
Namespace Prefix:	bxc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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