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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3)
 12 Months Ended
Jan. 31, 2015
item
SIGNIFICANT SUPPLIERS  
Commitment to purchase number of units of oil products at various prices 3,500,000us-gaap_LongTermPurchaseCommitmentMinimumQuantityRequired
Period for commitment to purchase oil products 2 years
Merchandise purchased | Supplier concentration risk  
SIGNIFICANT SUPPLIERS  
Number of largest suppliers 1pby_NumberOfLargestSuppliers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
Merchandise purchased | Supplier concentration risk | Maximum  
SIGNIFICANT SUPPLIERS  
Concentration risk percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Merchandise purchased | Supplier concentration risk | Ten largest suppliers  
SIGNIFICANT SUPPLIERS  
Number of largest suppliers 10pby_NumberOfLargestSuppliers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ pby_MajorSupplierAxis
= pby_TenSuppliersMember
Concentration risk percentage 42.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ pby_MajorSupplierAxis
= pby_TenSuppliersMember