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Income taxes (Details)
12 Months Ended
Oct. 31, 2017
USD ($)
Income Tax Disclosure [Abstract]  
Ordinary taxable income distributed as dividends (percentage) 100.00%
Deferral of capital gain on sale of property from qualification as like-kind exchange of real estate pursuant to Section 1031 of the Internal Revenue Code $ 15,400,000
Amount by which tax basis of replacement property in like-kind exchange is lower than acquisition cost 18,800,000
Acquisition cost $ 19,500,000