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Lease Commitments - Narrative (Details) $ in Thousands | Sep. 29, 2018 USD ($)
--- | ---
Leases [Abstract] |
Carrying amount of capital leases | $ 166,500
Net book value of capital leases | 143,700
Principal |
2018 | 2,118
2019 | 7,498
2020 | 6,749
2021 | 4,389
2022 | 3,620
Thereafter | 128,859
Total | 153,233
Interest |
2018 | 3,523
2019 | 13,802
2020 | 13,425
2021 | 13,127
2022 | 12,921
Thereafter | 182,788
Total | $ 239,586

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
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
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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 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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- 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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Data Type: | xbrli:monetaryItemType
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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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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
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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 next fiscal year following the latest fiscal year for capital leases. + References No definition available. + Details
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- 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
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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
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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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Data Type: | xbrli:monetaryItemType
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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
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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

X
- Definition Represents carrying amount of capital leases related to trucks and trailers. + References No definition available. + Details
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- Definition Interest Payments on Capital Leases [Abstract] + References No definition available. + Details
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- Definition Represents net book value of capital leases related to trucks and trailers. + References No definition available. + Details
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- Definition Principal Payments on Capital Leases [Abstract] + References No definition available. + Details
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- References No definition available. + Details
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