Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Components of Net Periodic Pension Cost (Details)

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Employee Benefit Plans - Components of Net Periodic Pension Cost (Details) - Pension Plan - Foreign Plan - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Components of net periodic pension cost      
Service cost $ 4,127 $ 4,015 $ 3,349
Interest cost 1,302 1,117 1,322
Return on plan assets (428) (393) (406)
Amortization of transitional obligation 0 251 249
Amortization of prior service cost 26 46 46
Amortization of net loss 1,731 1,617 1,132
Net periodic pension cost $ 6,758 $ 6,653 $ 5,692