Derivatives and Hedging Activities (Cash Flow Hedge Included in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Net increase (decrease) in accumulated other comprehensive income, net of tax	$ 2,249	$ (4,646)	$ (3,277)
Interest rate swap agreement
Derivative Instruments, Gain (Loss) [Line Items]
Net interest expense (income) recognized as a result of interest rate swap	2,250	799	(233)
Unrealized gain (loss) in fair value of interest swap rates	731	(6,900)	(4,159)
Net increase in accumulated other comprehensive income (loss)	2,981	(6,101)	(4,392)
Income tax effect	(732)	1,455	1,115
Net increase (decrease) in accumulated other comprehensive income, net of tax	$ 2,249	$ (4,646)	$ (3,277)