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Employee Benefit Plans - Fair values of plan assets by asset category (Details 6) - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category $ 54,293 $ 44,032 $ 39,581
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 9,357 8,798  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 24,424 26,245  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 20,513 8,989 $ 10,031
Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 54,294 44,032  
Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 713 129  
Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Cash and cash equivalents | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 713 129  
Common-collective funds - Global large cap equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Common-collective funds - Global large cap equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 11,963 10,995  
Common-collective funds - Global large cap equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 6,596  
Common-collective funds - Global large cap equities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 18,559 10,995  
Common-collective funds - Fixed income securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Common-collective funds - Fixed income securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 7,583 8,565  
Common-collective funds - Fixed income securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Common-collective funds - Fixed income securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 7,583 8,565  
Common-collective funds - Global asset allocations/risk parity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Common-collective funds - Global asset allocations/risk parity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 4,878 6,685  
Common-collective funds - Global asset allocations/risk parity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Common-collective funds - Global asset allocations/risk parity | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 4,878 6,685  
Mutual funds - Global Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 4,611 4,366  
Mutual funds - Global Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Mutual funds - Global Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Mutual funds - Global Equities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 4,611 4,366  
Mutual funds - Fixed income securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,366    
Mutual funds - Fixed income securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category    
Mutual funds - Fixed income securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category    
Mutual funds - Fixed income securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,366    
Mutual funds - Global asset allocations/risk parity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 2,667 4,303  
Mutual funds - Global asset allocations/risk parity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Mutual funds - Global asset allocations/risk parity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Mutual funds - Global asset allocations/risk parity | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 2,667 4,303  
Other - Fixed income securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category    
Other - Fixed income securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category    
Other - Fixed income securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,434    
Other - Fixed income securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,434    
Other - Global asset allocations/risk parity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Other - Global asset allocations/risk parity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Other - Global asset allocations/risk parity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 6,554 4,251  
Other - Global asset allocations/risk parity | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 6,554 4,251  
Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category  
Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 5,929 4,738  
Other | Total      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category $ 5,929 $ 4,738