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Employee Benefits (Detail Textuals 1)	12 Months Ended
	Dec. 29, 2012
Asset allocation structure of the portfolio
Compound annualized risk free rate	4.10%
Expected overall portfolio return percentage	8.35%
Percentage of estimated expense	0.50%
Net long term rate of return	7.85%
Equities
Asset allocation structure of the portfolio
Asset allocation structure of the portfolio	65.00%
Equity securities - domestic
Asset allocation structure of the portfolio
Target allocations for fiscal 2013	50.00%
Equity securities - international
Asset allocation structure of the portfolio
Target allocations for fiscal 2013	15.00%
Fixed income
Asset allocation structure of the portfolio
Asset allocation structure of the portfolio	30.00%
Target allocations for fiscal 2013	30.00%
Other
Asset allocation structure of the portfolio
Asset allocation structure of the portfolio	5.00%
Target allocations for fiscal 2013	5.00%

X

- Definition

Represents compound annualized risk free rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
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X

- Definition

Represents the estimated target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

No definition available.

+ Details

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X

- Definition

Normal allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

No definition available.

+ Details

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X

- Definition

Represents expected overall portfolio return, percentage.

+ References

No definition available.

+ Details

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X

- Definition

Represents percentage of estimated expense.

+ References

No definition available.

+ Details

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X

- Definition

Represents net long term rate of return.

+ References

No definition available.

+ Details

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- Details

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