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Employee Benefit Plans - Schedule of Single Employer Pension Plans (Details) - Pension Plan - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 859 1,059 2,578 3,177
Expected return on plan assets (1,038) (1,102) (3,113) (3,305)
Amortization of net loss (gain) 502 370 1,507 1,109
Net periodic benefit cost $ 323 $ 327 $ 972 $ 981
Weighted average assumptions used to determine benefit obligations        
Discount rate     2.55% 3.45%
Expected long-term return on plan assets     6.25% 6.75%