Business Acquisition (Schedule of Finite-Lived and Indefinite-Lived Intangible Assets Acquired) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019
Business Acquisition, Acquiree - L'Orange [Member]
Business Acquisition [Line Items]
Intangible assets	$ 573,427	$ 573,427
Business Acquisition, Acquiree - L'Orange [Member] | Trade Name [Member]
Business Acquisition [Line Items]
Intangible assets	$ 67,298
Process Technology [Member]
Business Acquisition [Line Items]
Weighted Average Useful Life	22 years
Process Technology [Member] | Business Acquisition, Acquiree - L'Orange [Member]
Business Acquisition [Line Items]
Intangible assets	$ 74,260
Customer Relationships And Contracts [Member]
Business Acquisition [Line Items]
Weighted Average Useful Life	22 years
Customer Relationships And Contracts [Member] | Business Acquisition, Acquiree - L'Orange [Member]
Business Acquisition [Line Items]
Intangible assets	$ 388,705
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Weighted Average Useful Life	3 years
Other Intangible Assets [Member] | Business Acquisition, Acquiree - L'Orange [Member]
Business Acquisition [Line Items]
Intangible assets	$ 232
Backlog [Member]
Business Acquisition [Line Items]
Weighted Average Useful Life	1 year
Backlog [Member] | Business Acquisition, Acquiree - L'Orange [Member]
Business Acquisition [Line Items]
Intangible assets	$ 42,932