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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jan. 31, 2015
Jan. 31, 2015
Feb. 01, 2014
Nov. 29, 2014
Gain on Insurance Recovery        
Merchandise inventories $ 734,956us-gaap_InventoryNet $ 734,956us-gaap_InventoryNet $ 709,733us-gaap_InventoryNet  
Gain on insurance recovery 10,779bont_GainOnInsuranceRecovery 10,779bont_GainOnInsuranceRecovery    
Store fire, North Riverside, Illinois        
Gain on Insurance Recovery        
Merchandise inventories       5,980us-gaap_InventoryNet
/ us-gaap_BusinessInterruptionLossAxis
= bont_StoreFireNorthRiversideIllinoisMember
Gain on insurance recovery $ 10,779bont_GainOnInsuranceRecovery
/ us-gaap_BusinessInterruptionLossAxis
= bont_StoreFireNorthRiversideIllinoisMember		 $ 10,779bont_GainOnInsuranceRecovery
/ us-gaap_BusinessInterruptionLossAxis
= bont_StoreFireNorthRiversideIllinoisMember