Other Balance Sheet Information Summary of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials and purchased parts	$ 57,400	$ 57,250
Work-in-process	21,795	20,068
Finished goods	15,972	16,249
Inventory, net	95,167	93,567
Reserves for excess and obsolete inventory	$ 24,800	$ 26,000