Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - Fair Value of Plan Assets (Details)

v3.21.2
EMPLOYEE BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($)
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure      
Defined benefit plan, target plan asset allocations 100.00% 100.00%  
Defined benefit plan, estimated future employer contributions in next fiscal year $ 4,700,000    
Defined benefit plan maximum yearly expected future benefit 6,400,000    
Fair Value Measurements      
Total assets measured at fair value 44,726,000 $ 37,928,000 $ 33,555,000
Recurring      
Fair Value Measurements      
Total assets measured at fair value 44,726,000 37,928,000  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Fair Value Measurements      
Total assets measured at fair value 25,458,000 21,420,000  
Recurring | Significant Other Observable Inputs (Level 2)      
Fair Value Measurements      
Total assets measured at fair value 19,268,000 16,508,000  
Recurring | Cash and cash equivalents      
Fair Value Measurements      
Total assets measured at fair value 25,458,000 21,420,000  
Recurring | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Fair Value Measurements      
Total assets measured at fair value 25,458,000 21,420,000  
Recurring | Cash and cash equivalents | Significant Other Observable Inputs (Level 2)      
Fair Value Measurements      
Total assets measured at fair value 0 0  
Recurring | Bonds, equity securities and other investments      
Fair Value Measurements      
Total assets measured at fair value 19,268,000 16,508,000  
Recurring | Bonds, equity securities and other investments | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Fair Value Measurements      
Total assets measured at fair value 0 0  
Recurring | Bonds, equity securities and other investments | Significant Other Observable Inputs (Level 2)      
Fair Value Measurements      
Total assets measured at fair value $ 19,268,000 $ 16,508,000