Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Fair Value of Plan Assets (Details)

v3.19.2
Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($)
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
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 $ 3,100,000    
Defined benefit plan maximum yearly expected future benefit 5,300,000.0    
Fair Value Measurements      
Total assets measured at fair value 33,555,000 $ 27,932,000 $ 21,780,000
Recurring      
Fair Value Measurements      
Total assets measured at fair value 33,555,000 27,932,000  
Recurring | Level 1      
Fair Value Measurements      
Total assets measured at fair value 18,571,000 15,737,000  
Recurring | Level 2      
Fair Value Measurements      
Total assets measured at fair value 14,984,000 12,195,000  
Recurring | Cash and cash equivalents      
Fair Value Measurements      
Total assets measured at fair value 18,571,000 15,737,000  
Recurring | Cash and cash equivalents | Level 1      
Fair Value Measurements      
Total assets measured at fair value 18,571,000 15,737,000  
Recurring | Cash and cash equivalents | 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 14,984,000 12,195,000  
Recurring | Bonds, equity securities and other investments | Level 1      
Fair Value Measurements      
Total assets measured at fair value 0 0  
Recurring | Bonds, equity securities and other investments | Level 2      
Fair Value Measurements      
Total assets measured at fair value $ 14,984,000 $ 12,195,000