Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Inventory [Line Items]
Finished goods	$ 5,442	$ 9,020
Work-in-process	40,180	36,032
Raw materials and supplies	16,249	14,520
Under (over) applied manufacturing overhead costs	2,819
Total	$ 64,690	$ 59,572