Significant Accounting Policies (Summary of Activity Related to Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of period	$ 24,126	$ 22,360
Acquisitions and Dispositions		(1,493)
Provisions	4,312	11,824
Write-offs	(5,605)	(5,080)
Balance at end of period	$ 22,833	28,028
Accumulated Deficit [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of period		$ 417