Inventories (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Oct. 31, 2017
Inventories
Raw materials	$ 47,710		$ 52,898
Work-in-process	16,444		18,623
Finished goods	176,426		185,488
Deferred cost of goods sold	64,445		61,340
Inventories before provision	305,025		318,349
Provision for excess and obsolescence	(49,774)		(51,206)
Total inventories	255,251		$ 267,143
Provisions	$ 6,804	$ 5,431