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Employee Benefit Plans - Fair values of plan assets by asset category (Details 6) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category $ 58,648 $ 57,110 $ 54,293
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 428 6,094  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 51,260 35,057  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 6,960 15,959 $ 20,513
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 428 3,023  
Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 428 3,023  
Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Common-collective funds - Global large cap equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 15,443 19,517  
Common-collective funds - Global large cap equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Common-collective funds - Global large cap equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 11,632 12,385  
Common-collective funds - Global large cap equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 3,811 7,132  
Common-collective funds - Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 36,671 17,986  
Common-collective funds - Fixed income securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Common-collective funds - Fixed income securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 36,671 16,850  
Common-collective funds - Fixed income securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 1,136  
Common-collective funds - Global asset allocations/risk parity      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 2,957 5,822  
Common-collective funds - Global asset allocations/risk parity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Common-collective funds - Global asset allocations/risk parity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 2,957 5,822  
Common-collective funds - Global asset allocations/risk parity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Mutual funds - Global Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   1,972  
Mutual funds - Global Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   1,972  
Mutual funds - Global Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   0  
Mutual funds - Global Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   0  
Mutual funds - Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   1,099  
Mutual funds - Fixed income securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   1,099  
Mutual funds - Fixed income securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   0  
Mutual funds - Fixed income securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   0  
Mutual funds - Global asset allocations/risk parity      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   0  
Mutual funds - Global asset allocations/risk parity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   0  
Mutual funds - Global asset allocations/risk parity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   0  
Mutual funds - Global asset allocations/risk parity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category   0  
Other - Global asset allocations/risk parity      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 2,881 4,103  
Other - Global asset allocations/risk parity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Other - Global asset allocations/risk parity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Other - Global asset allocations/risk parity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 2,881 4,103  
Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 268 3,588  
Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category $ 268 $ 3,588