Other Balance Sheet Information Summary of Inventories (Detail) (USD $)	Mar. 31, 2013	Sep. 30, 2012
Inventories
Raw materials and purchased parts	$ 60,762,000	$ 64,732,000
Work-in-process	20,659,000	20,800,000
Finished goods	15,180,000	17,453,000
Inventory, net	96,601,000	102,985,000
Reserves for excess and obsolete inventory	$ 25,500,000	$ 23,200,000