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Revenue (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Billed accounts receivable due within	60 days		60 days
Noncurrent unbilled receivables	$ 28,278		$ 28,278		$ 1,573
Revenue from contract liabilities	$ 8,356	$ 6,147	$ 28,288	$ 26,459
Net Sales [Member] | Manufactured Products [Member]
Percentage of attributable to revenue	86.00%	84.00%	86.00%	86.00%
Net Sales [Member] | MRO Products [Member]
Percentage of attributable to revenue	12.00%	13.00%	12.00%	12.00%

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