Defined Benefit Pension Obligation - Amounts Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Amounts recognized within the consolidated balance sheets:
Assets	$ 480,098	$ 490,927
Defined benefit pension plan
Amounts recognized within the consolidated balance sheets:
Long-term other liabilities	(4,286)	(4,468)
Net amount recognized	(4,286)	(4,468)
Amounts recognized in accumulated other comprehensive loss (before tax)
Net loss	(1,236)	(1,000)
Total recognized in other comprehensive income (loss)	872	(236)	$ (856)
Accumulated other comprehensive loss	(364)	(1,236)
Accumulated benefit obligations in excess of fair value of plan assets:
Projected benefit obligation	18,705	18,426
Accumulated benefit obligation	16,891	16,175
Fair value of plan assets	$ 14,419	$ 13,958