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New U.S. GAAP Accounting Pronouncements (Detail Textual)	Feb. 01, 2016
Weighted Average Lease term	12 months

X

- Definition

Weighted Average Term of Lease.

+ References

No definition available.

+ Details

Name:	cik0001013131_WeightedAverageLeaseTerm
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration