Goodwill (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended			36 Months Ended	12 Months Ended	3 Months Ended				12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013	Sep. 30, 2013 Aerospace [Member]	Jun. 30, 2013 Renewable Power Systems Reporting Unit [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]	Dec. 31, 2012 Business Acquisition, Acquiree - Duarte Business [Member] Aerospace [Member]	Sep. 30, 2013 U.S. Government Related [Member] Sales [Member]	Sep. 30, 2012 U.S. Government Related [Member] Sales [Member]	Sep. 30, 2011 U.S. Government Related [Member] Sales [Member]	Sep. 30, 2013 Indirect Sales to U.S. Government [Member] Sales [Member]	Sep. 30, 2012 Indirect Sales to U.S. Government [Member] Sales [Member]	Sep. 30, 2011 Indirect Sales to U.S. Government [Member] Sales [Member]	Sep. 30, 2013 Direct Sales to U.S. Government [Member] Sales [Member]	Sep. 30, 2012 Direct Sales to U.S. Government [Member] Sales [Member]	Sep. 30, 2011 Direct Sales to U.S. Government [Member] Sales [Member]	Sep. 30, 2013 General Electric [Member] Sales [Member]	Sep. 30, 2012 General Electric [Member] Sales [Member]	Sep. 30, 2011 General Electric [Member] Sales [Member]
Goodwill addition		$ 88,477,000	$ 0			$ 88,477,000				$ 88,477,000
Reduction to goodwill due to favorable resolution of lease termination recorded in restructuring reserve		0	0	103,000
Impairment	$ 0				$ 0		$ 0
Weighted average cost of capital assumption								8.85%	10.32%
Assumed annual compound growth rate after five or ten years								4.25%	4.50%
Percentage of total attributable to major customer											21.00%	18.00%	19.00%	15.00%	14.00%	15.00%	6.00%	4.00%	4.00%	15.00%	14.00%	14.00%