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BENEFIT PLANS (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Feb. 02, 2013
Pension expense  
Interest cost $ 2,170us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (2,658)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of prior service cost 13us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Recognized actuarial loss 1,896us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Net Period Pension Cost 1,421pby_DefinedBenefitPlanNetPeriodicBenefitCostExcludingSettlementCharge
Settlement Charge 17,753us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Net periodic benefit cost $ 19,174us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost