Segment and Geographic Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Summaries of net sales by geographic area
Other									$ 7,346	$ 3,806	$ 2,599
Net sales	36,949	55,201	56,233	43,281	32,805	46,368	50,696	43,101	191,664	172,970	128,533
Canada [Member]
Summaries of net sales by geographic area
Net sales									59,602	13,158	6,011
Europe [Member]
Summaries of net sales by geographic area
Net sales									3,043	34,278	13,375
Middle East [Member]
Summaries of net sales by geographic area
Net sales									8,542	6,588	9,441
United States [Member]
Summaries of net sales by geographic area
Net sales									102,378	92,368	85,423
Asia [Member]
Summaries of net sales by geographic area
Net sales									$ 10,753	$ 22,772	$ 11,684