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EMPLOYEE BENEFIT PLANS - Change in Benefit Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Change in Benefit Obligation      
Benefit obligation at beginning of year $ 13,726 $ 13,305  
Translation adjustment 57 (88)  
Interest costs 467 453 $ 582
Curtailment (369)    
Actuarial (gain) loss 61 435  
Benefits paid (162) (379)  
Benefit obligation at end of year 13,780 13,726 13,305
Change in Plan Assets      
Fair value of plan assets at beginning of year 5,555 5,210  
Translation adjustment 43 (122)  
Actual return on plan assets 388 745  
Company contributions   65  
Benefits paid (116) (343)  
Fair value of plan assets at end of year 5,870 5,555 5,210
Funded status (7,910) (8,171)  
Net amount recognized (7,910) (8,171)  
Amount recognized in consolidated balance sheets consists of:      
Investments 1,065 759  
Accrued pension liability (8,975) (8,051)  
Accumulated other comprehensive income 1,202 2,016  
Net Periodic Benefit Costs      
Interest costs 467 453 582
Expected return on plan assets (203) (200) (303)
Amortization of prior service costs 249 279 420
Recognized actuarial loss 305 317 43
Net periodic benefit cost $ 818 $ 849 $ 742
Weighted average assumptions at year-end:      
Discount rate (as a percent) 3.40% 3.40%  
Expected return on plan assets (as a percent) 4.70% 3.80%  
Rate of compensation increase (as a percent) 3.00% 3.00%