Segment Information (Consolidated Depreciation and Amortization by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 116,131	$ 80,917	$ 69,036
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	9,608	9,219	7,799
Aerospace [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	54,828	47,277	40,825
Industrial [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 51,695	$ 24,421	$ 20,412

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Name:	us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration