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Loans Payable, Senior Notes and Mortgage Company Loan Facility Senior Notes Payable (Details Textual 4) $ in Millions | Jan. 31, 2017 USD ($) debtissuances
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Senior Note Payable (Textual) [Abstract] |
Number of issuances of senior debt | debtissuances | 8
Senior Notes [Member] |
Senior Note Payable (Textual) [Abstract] |
Debt Instrument, Face Amount | $ | $ 2,707

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- Definition Number of issuances of senior debt + References No definition available. + Details
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Balance Type: | na
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- Definition Senior note payable. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
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