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, 2017
Jun. 30, 2016
Jun. 30, 2015
Components of net periodic pension cost      
Service cost $ 4,015 $ 3,349 $ 3,905
Interest cost 1,117 1,322 1,562
Return on plan assets (393) (406) (450)
Amortization of transitional obligation 251 249 259
Amortization of prior service cost 46 46 46
Amortization of net loss 1,617 1,132 1,014
Adjustment 0 0 (177)
Net periodic pension cost $ 6,653 $ 5,692 $ 6,159