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Employee Benefit Plans - Net periodic pension expense (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Compensation and Retirement Disclosure [Abstract]      
Service cost - benefits earned during the year $ 2,457 $ 2,729 $ 2,093
Interest cost on benefit obligation 2,333 2,058 1,957
Expected return on plan assets (2,334) (2,136) (2,040)
Amortization of net actuarial loss and prior service costs 904 1,405 251
Net periodic pension expense $ 3,360 $ 4,056 $ 2,261