The Gross Leasable Area of the properties the Company owned or had equity interest in.

No definition available.

Name:	uba_GrossLeasableAreaOfPropertiesTheCompanyOwnedOrHadEquityInterestIn
Namespace Prefix:	uba_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of operating expenses including property taxes that are associated with the entity's normal revenue producing operation.

+ References

No definition available.

+ Details

Name:	uba_OperatingExpensesIncludingPropertyTaxes
Namespace Prefix:	uba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the percentage of the rental property leased.

+ References

No definition available.

+ Details

Name:	uba_PercentLeased
Namespace Prefix:	uba_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: 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=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of income (loss) from continuing operations, nonoperating income (expense) and income (loss) from equity method investments, before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of interest income (expense).

+ References

No definition available.

+ Details

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

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.9)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

Name:	us-gaap_InterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=uba_RidgewayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueServicesNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AssetsTotalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=uba_BaseRentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=uba_StopAndShopSupermarketCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=uba_BedBathAndBeyondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=uba_MarshallSIncADivisionOfTheTJXCompaniesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=uba_AllOtherTenantsAtRidgewayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2018 USD ($) ft²	Apr. 30, 2017 USD ($)	Apr. 30, 2018 USD ($) ft² Segment	Apr. 30, 2017 USD ($)	Oct. 31, 2017
Segment Reporting [Abstract]
Number of reportable segments \| Segment			1
Ridgeway Significant Tenants [Abstract]
Gross leasable area of properties the Company owned or had equity interest in \| ft²	5,100,000		5,100,000
Income Statements [Abstract]
Revenues	$ 37,005	$ 29,992	$ 70,000	$ 58,959
Operating expenses	10,897	10,235	22,350	20,231
Interest expense	3,316	3,259	6,739	6,516
Depreciation and amortization	6,968	6,183	13,917	12,764
Income from continuing operations	$ 14,022	8,459	$ 23,101	$ 15,663
Ridgeway [Member]
Ridgeway Significant Tenants [Abstract]
Gross leasable area of properties the Company owned or had equity interest in \| ft²	374,000		374,000
Percent leased			96.00%	96.00%	96.00%
Income Statements [Abstract]
Revenues	$ 3,367	3,537	$ 6,820	$ 7,003
Operating expenses	940	1,005	1,916	2,090
Interest expense	434	608	1,011	1,220
Depreciation and amortization	655	634	1,336	1,745
Income from continuing operations	1,338	1,291	2,557	1,948
All Other Operating Segments [Member]
Income Statements [Abstract]
Revenues	33,638	26,455	63,180	51,956
Operating expenses	9,957	9,230	20,434	18,141
Interest expense	2,882	2,651	5,728	5,296
Depreciation and amortization	6,313	5,549	12,581	11,019
Income from continuing operations	$ 12,684	$ 7,168	$ 20,544	$ 13,715
Sales Revenue, Services, Net [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Sales Revenue, Services, Net [Member] \| Ridgeway [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	9.10%	11.80%	9.70%	11.90%
Sales Revenue, Services, Net [Member] \| All Other Operating Segments [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	90.90%	88.20%	90.30%	88.10%
Assets, Total [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	100.00%	100.00%	100.00%		100.00%
Assets, Total [Member] \| Ridgeway [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	7.10%	7.20%	7.10%		7.20%
Assets, Total [Member] \| All Other Operating Segments [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	92.90%	92.80%	92.90%		92.80%
Base Rent [Member] \| Customer Concentration Risk [Member] \| Ridgeway [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Base Rent [Member] \| Customer Concentration Risk [Member] \| The Stop & Shop Supermarket Company [Member] \| Ridgeway [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	21.00%	19.00%	21.00%	19.00%
Base Rent [Member] \| Customer Concentration Risk [Member] \| Bed, Bath & Beyond [Member] \| Ridgeway [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	14.00%	14.00%	14.00%	14.00%
Base Rent [Member] \| Customer Concentration Risk [Member] \| Marshall's Inc., a Division of the TJX Companies [Member] \| Ridgeway [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	11.00%	11.00%	10.00%	11.00%
Base Rent [Member] \| Customer Concentration Risk [Member] \| All Other Tenants at Ridgeway [Member] \| Ridgeway [Member]
Ridgeway Significant Tenants [Abstract]
Concentration risk, percentage	54.00%	56.00%	55.00%	56.00%