Fair Value Measurements (Reconciliation of Contingent Consideration Liabilities Related to Acquisitions) (Details) - Contingent consideration [Member] - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance beginning of year	$ 2,532	$ 6,705	$ 6,705
Change in contingent consideration liability	(2,532)	(4,173)
Balance at end of period	$ 0	$ 2,532	$ 2,532