Pension Plans and Other Post Retirement Benefits - Components of Net Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Assumptions:
Net pension expense			$ 1,869	$ 2,061
Pension Plan
Assumptions:
Service cost	$ 470	$ 409	930	1,069	$ 1,913
Interest cost	332	244	658	533	1,059
Amortization of actuarial (gains) and losses	90	178	181	369
Net pension expense	892	831	1,769	1,971
Pension Plan | CDT
Assumptions:
Service cost	125	112	249	232	467
Interest cost	151	109	301	226	456
Amortization of actuarial (gains) and losses	134	150	268	310
Net pension expense	410	371	818	768
Pension Plan | GXS Germany
Assumptions:
Service cost	117	94	234	195	395
Interest cost	122	90	243	186	377
Amortization of actuarial (gains) and losses	18	40	36	83
Net pension expense	257	224	513	464
Pension Plan | GXS Philippines
Assumptions:
Service cost	228	203	447	642	1,051
Interest cost	59	45	114	121	$ 226
Amortization of actuarial (gains) and losses	(62)	(12)	(123)	(24)
Net pension expense	$ 225	$ 236	$ 438	$ 739