For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Segment Information (Narrative) (Details) - segment	12 Months Ended
Segment Information (Narrative) (Details) - segment	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Entity Wide Revenue Major Customer [Line Items]
Number of Reportable Segments	2
General Electric [Member] \| Sales [Member] \| Product Concentration Risk [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of total attributable to major customer	11.00%	11.00%	14.00%
General Electric [Member] \| Trade Accounts Receivable [Member] \| Product Concentration Risk [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of total attributable to major customer	10.00%	9.00%
Boeing Company [Member] \| Sales [Member] \| Product Concentration Risk [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of total attributable to major customer	13.00%	14.00%	15.00%
Boeing Company [Member] \| Trade Accounts Receivable [Member] \| Product Concentration Risk [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of total attributable to major customer	14.00%	13.00%