Income taxes (Details) $ in Millions |
12 Months Ended |
|---|---|
|
Oct. 31, 2019
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 | $ 15.4 |
| Amount by which tax basis of replacement property in like-kind exchange is lower than acquisition cost | 18.9 |
| Acquisition cost | $ 19.6 |