Summary of Inventories, Priced at Lower of Cost (First-In, First-Out Method) or Market (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Oct. 31, 2011
Schedule of Inventory [Line Items]
Purchased parts and sub-assemblies	$ 24,050	$ 20,925
Work-in-process	16,831	15,440
Finished goods	54,836	44,762
Inventories, net	$ 95,717	$ 81,127