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Employee Benefit Plans - Changes in projected benefit obligation, plan assets and funded status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Change in projected benefit obligation      
Projected benefit obligation at beginning of year $ 57,599 $ 46,569  
Service cost 2,954 2,457 $ 2,729
Interest cost 2,618 2,333 2,058
Benefits paid (1,116) (1,092)  
Actuarial (gain) loss 550 7,332  
Projected benefit obligation at end of year 62,605 57,599 46,569
Change in plan assets      
Fair value of plan assets at beginning of year 39,581 31,501  
Actual return on plan assets (1,248) 4,339  
Employer contributions 6,815 4,833  
Benefits paid (1,116) (1,092)  
Fair value of plan assets at end of year 44,032 39,581 $ 31,501
Funded status at end of year $ (18,573) $ (18,018)