Financial covenants representing the threshold amount for calculating minimum excess availability.

No definition available.

Name:	bont_DebtInstrumentCovenantMinimumExcessAvailabilityThresholdAmount
Namespace Prefix:	bont_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Threshold percentage used in the calculation of a minimum excess availability financial covenant contained in a credit facility agreement.

+ References

No definition available.

+ Details

Name:	bont_DebtInstrumentCovenantMinimumExcessAvailabilityThresholdPercentage
Namespace Prefix:	bont_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The LIBOR floor rate utilized in determining the variable rate for Tranche of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	bont_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the ability to meet its fixed-charge obligations: the ratio of (Earnings before interest, depreciation and amortization minus unfunded capital expenditures and distributions) divided by total debt service (annual principal and interest payments).

+ References

No definition available.

+ Details

Name:	bont_LineOfCreditFacilityFixedChargeCoverageRatio
Namespace Prefix:	bont_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=bont_FederalFundsInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=bont_LondonInterbankOfferedRateLiborOneMonthMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bont_SeniorSecuredCreditFacilityTrancheA1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=bont_DebtInstrumentVariableRateAdjustedLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bont_SeniorSecuredCreditFacilityExpiresDecember2018TrancheMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=bont_OnOrAfterJanuary292017Member
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
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LONG-TERM DEBT (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Aug. 15, 2016	Oct. 29, 2016	Oct. 29, 2016	Oct. 31, 2015	Aug. 14, 2016
Long-term debt
Loss on extinguishment of debt		$ 676	$ 676	$ 4,862
Second Amended Revolving Credit Facility
Long-term debt
Revolving commitments	$ 880,000
Calculation of minimum excess availability, percentage	10.00%
Calculation of minimum excess availability, threshold amount	$ 75,000
Second Amended Revolving Credit Facility \| Federal Funds Rate
Long-term debt
Interest rate margin (as a percent)	0.50%
Second Amended Revolving Credit Facility \| One month adjusted LIBOR
Long-term debt
Interest rate margin (as a percent)	1.00%
Second Amended Revolving Credit Facility \| Tranche A-1
Long-term debt
Revolving commitments	$ 150,000				$ 100,000
Second Amended Revolving Credit Facility \| Tranche A-1 \| Adjusted LIBOR
Long-term debt
Interest rate margin (as a percent)	9.50%
LIBOR floor rate (as a percent)	1.00%
Second Amended Revolving Credit Facility \| Tranche A-1 \| Base Rate
Long-term debt
Interest rate margin (as a percent)	8.50%
Second Amended Revolving Credit Facility \| Tranche A
Long-term debt
Revolving commitments	$ 730,000
On or after January 29, 2017 \| Second Amended Revolving Credit Facility
Long-term debt
Calculation of minimum excess availability, percentage	20.00%
On or after January 29, 2017 \| Second Amended Revolving Credit Facility \| Minimum
Long-term debt
Fixed charge coverage ratio	1.00