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Lease Commitments (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Leases [Abstract]
Carrying amount of capital leases	$ 126,000
Net book value of capital leases	110,200
Principal Payments on Capital Leases [Abstract]
2018	1,807
2019	1,840
2020	1,501
2021	127
2022	(392)
Thereafter	107,452
Total	112,335
Interest Payments on Capital Leases [Abstract]
2018	8,728
2019	11,567
2020	11,509
2021	11,514
2022	11,570
Thereafter	178,594
Total	$ 233,482

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

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