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Prepaid expenses (Details) - USD ($)
$ in Thousands
Oct. 31, 2020
Oct. 31, 2019
Prepaid Expense, Current [Abstract]    
Parts and supplies $ 36,109 $ 33,617
Prepaid insurance 10,675 8,859
Other prepaid expenses 10,760 14,455
Total prepaid expenses $ 57,544 $ 56,931