Derivatives and Hedging Activities (Schedule of Cash Flow Hedge Included in Accumulated Other Comprehensive Income (Loss), Net of Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2022	Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Net increase in accumulated other comprehensive income, net of tax	$ 3,144	$ 1,172	$ 413	$ 1,582	$ 519	$ 109	$ 4,730	$ 2,209
Interest rate swap agreement
Derivative Instruments, Gain (Loss) [Line Items]
Net interest expense recognized as a result of interest rate swap	532			557			1,689	1,682
Unrealized gain in fair value of interest rate swap	3,675			1,549			4,658	1,281
Net increase in accumulated other comprehensive income	4,207			2,106			6,347	2,963
Income tax effect	1,062			524			1,619	754
Net increase in accumulated other comprehensive income, net of tax	$ 3,145			$ 1,582			$ 4,728	$ 2,209