Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Components Of Inventory [Line Items]
Finished goods	$ 8,963	$ 2,075
Work-in-process	36,463	28,851
Raw materials and supplies	10,005	12,340
Deferred cost of revenues	4,941	891
Under(over) applied manufacturing overhead costs	(2,737)
Total	$ 57,635	$ 44,157