Defined Benefit Pension Obligation - Amounts Recognized (Details) - Defined benefit pension plan - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Amounts recognized within consolidated balance sheets:
Long-term other liabilities	$ (2,686)	$ (2,863)
Net amount recognized	2,686	2,863
Amounts recognized in accumulated other comprehensive loss (before tax)
Net loss	(2,066)	(1,517)
Prior service cost (credit)	949	(549)
Accumulated other comprehensive loss	1,117	2,066
Accumulated benefit obligations in excess of fair value of plan assets:
Projected benefit obligation	13,979	12,435
Accumulated benefit obligation	11,293	9,572
Fair value of plan assets	$ 11,293	$ 9,572