Commitments and contingencies (Narrative) (Details) (USD $)	12 Months Ended
Oct. 31, 2014
Commercial space leases, net book value	$ 179,000,000
Lease terms for tenants, periods	25 years
Westwood Plaza Shopping Center [Member]
Flood insurance, amount per incident	$ 500,000

The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant