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Commitments and contingencies (Schedule of Minimum Rental Income) (Details)
$ in Thousands
Oct. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2020 $ 20,055
2021 18,911
2022 15,624
2023 12,993
2024 10,838
Thereafter 46,412
Total $ 124,833