Inventories (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2016
Inventory, Net [Abstract]
Raw materials				$ 33,298	$ 32,818
Finished goods and work in process				32,347	35,538
Supplies and other				2,020	2,593
Total				67,665	70,949
Inventory reserves	$ 3,790	$ 4,375	$ 4,375	6,484	3,790	$ 4,620
Inventories, net				$ 61,181	$ 67,159
Inventory Reserve Rollforward
Inventory reserves, beginning balance	3,790	4,375
Charged (credited) to costs & expenses	2,713	341	1,201
Write-offs	0	(939)	(1,415)
Other	19	(13)	31
Inventory reserves, ending balance	$ 6,484	$ 3,790	$ 4,375