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SHAREHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Shareholders' equity      
Dividends to shareholders (in dollars per share) $ 0.20us-gaap_CommonStockDividendsPerShareDeclared $ 0.20us-gaap_CommonStockDividendsPerShareDeclared $ 0.20us-gaap_CommonStockDividendsPerShareDeclared
Preferred stock, authorized shares 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized  
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued  
Common Stock      
Shareholders' equity      
Number of votes per share 1bont_NumberOfVotesPerCommonUnitHeld
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
   
Dividends to shareholders (in dollars per share) $ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Total dividends (in dollars) $ 3,374us-gaap_DividendsCommonStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 3,345us-gaap_DividendsCommonStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 3,304us-gaap_DividendsCommonStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Class A Common Stock      
Shareholders' equity      
Number of votes per share 10bont_NumberOfVotesPerCommonUnitHeld
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Dividends to shareholders (in dollars per share) $ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Total dividends (in dollars) $ 590us-gaap_DividendsCommonStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 590us-gaap_DividendsCommonStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 590us-gaap_DividendsCommonStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember