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New U.S. GAAP Accounting Pronouncements (Detail Textual) | Feb. 01, 2016
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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