Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Components Of Inventory [Line Items]
Finished goods	$ 6,399	$ 2,075
Work-in-process	39,162	28,851
Raw materials and supplies	11,028	12,340
Deferred cost of revenues	3,486	891
Under(over) applied manufacturing overhead costs	(2,098)
Total	$ 57,977	$ 44,157