Summaries of Sales by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Schedule Of Revenues From External Customers [Line Items]
Sales	$ 68,288	$ 78,148	$ 76,420	$ 77,751	$ 36,949	$ 55,201	$ 56,233	$ 43,281	$ 300,607	$ 191,664	$ 172,970
Other									10,856	7,346	3,806
Asia
Schedule Of Revenues From External Customers [Line Items]
Sales									8,789	10,753	22,772
Canada
Schedule Of Revenues From External Customers [Line Items]
Sales									74,839	59,602	13,158
Europe
Schedule Of Revenues From External Customers [Line Items]
Sales									115,226	3,043	34,278
Middle East
Schedule Of Revenues From External Customers [Line Items]
Sales									2,385	8,542	6,588
United States
Schedule Of Revenues From External Customers [Line Items]
Sales									$ 88,512	$ 102,378	$ 92,368