Segment Data and Related Information (Narrative) (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2020 customer	Jun. 30, 2019	Jun. 30, 2020 segment	Jun. 30, 2019	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of reporting segments | segment			2
Concentration risk, customers | customer	3
Concentration risk percentage	100.00%	100.00%
Percentage of long-lived assets located in the United States	97.00%		97.00%		85.00%
Customer Concentration Risk | Sales Revenue, Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Concentration risk percentage	58.00%	52.00%	55.00%	57.00%