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Lease Commitments - Schedule of Capital Lease Commitments (Details) $ in Thousands | Dec. 30, 2017 USD ($)
--- | ---
Principal |
2018 | $ 3,510
2019 | 2,861
2020 | 2,392
2021 | 867
2022 | 189
Thereafter | 7,751
Total | 17,570
Interest |
2018 | 1,203
2019 | 993
2020 | 818
2021 | 722
2022 | 693
Thereafter | 7,827
Total | $ 12,256

X
- Definition Represents amount of minimum lease interest payments for capital leases. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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
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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
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
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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
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
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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
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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
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Data Type: | xbrli:monetaryItemType
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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
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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
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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
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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
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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
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Principal Payments on Capital Leases [Abstract] + References No definition available. + Details
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