Investments - Supplemental Employee Retirement Plan Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Schedule of Trading Securities and Other Trading Assets
Total SERP investments	$ 10,517	$ 14,049
Total SERP obligation	10,517	14,049
Short-term Investments
Schedule of Trading Securities and Other Trading Assets
Total SERP investments	3,284	3,905
Total SERP obligation	3,284	3,905
Other Long-term Investments
Schedule of Trading Securities and Other Trading Assets
Total SERP investments	7,233	10,144
Total SERP obligation	$ 7,233	$ 10,144