Fair Value Measurements (Reconciliation of Liability) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Contingent Consideration | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period			$ 6,200
Fair value at end of period	$ 6,200		6,200
Fair Value, Inputs, Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	6,200	$ 8,000	6,200	$ 4,228
Contingent consideration recognized for acquired business	0	0	0	8,000
Contingent consideration payments	0	0	0	(10,000)
Change in fair value of contingent consideration	0	(2,100)	0	3,672
Fair value at end of period	6,200	$ 5,900	6,200	$ 5,900
Fair Value, Inputs, Level 3 | Contingent Consideration | Fair Value, Measurements, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period			6,200
Fair value at end of period	6,200		6,200
Fair Value, Inputs, Level 3 | Contingent Consideration | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Ctek, Inc. ("Ctek")
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at end of period	$ 300		$ 300