Summary of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Inventories
Raw materials and purchased parts	$ 61,012	$ 64,732
Work-in-process	25,525	20,800
Finished goods	18,586	17,453
Inventory, net	$ 105,123	$ 102,985