Fair Value Measurements (Rollforward of acquisition earnouts) (Details) - Fair Value, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	$ 1,545	$ 1,916
Payments	204	1,650
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	187
Reclassifications		0
Fair value adjustment	(1,267)	1,283
Foreign currency		(4)
Balance at the end of the period	295	1,545
Other Current Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	611	770
Payments	204	1,650
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	187
Reclassifications		212
Fair value adjustment	(333)	1,283
Foreign currency		(4)
Balance at the end of the period	295	611
Other Noncurrent Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	934	1,146
Payments	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0
Reclassifications		(212)
Fair value adjustment	(934)	0
Foreign currency		0
Balance at the end of the period	$ 0	$ 934