Loans Payable, Senior Notes and Mortgage Company Loan Facility Loans Payable - Other (Details Textual 3)	Apr. 30, 2017
Loans Payable [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.75%

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.

No definition available.

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