Capitalized interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Capitalized interest [Abstract]
Interest capitalized	$ 667,000	$ 524,000	$ 1,600,000	$ 744,000