Segment Information (Narrative) (Details) - segment	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment, Reporting Information [Line Items]
Number of Reportable Segments	2
The Boeing Company [Member] | Sales [Member]
Segment, Reporting Information [Line Items]
Percentage of total attributable to major customer	15.00%	12.00%	11.00%
The Boeing Company [Member] | Trade Accounts Receivable [Member]
Segment, Reporting Information [Line Items]
Percentage of total attributable to major customer	14.00%	14.00%
General Electric [Member] | Sales [Member]
Segment, Reporting Information [Line Items]
Percentage of total attributable to major customer	14.00%	16.00%	16.00%
General Electric [Member] | Trade Accounts Receivable [Member]
Segment, Reporting Information [Line Items]
Percentage of total attributable to major customer	8.00%	8.00%
U.S. Government Related [Member] | Sales [Member]
Segment, Reporting Information [Line Items]
Percentage of total attributable to major customer	23.00%	23.00%	23.00%
U.S. Government Related [Member] | Trade Accounts Receivable [Member]
Segment, Reporting Information [Line Items]
Percentage of total attributable to major customer	5.00%	3.00%