Pension Plans and Other Post Retirement Benefits - Schedule of the Change in Benefit Obligation (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation—beginning of period			$ 69,479	$ 61,886	$ 61,886
Service cost	$ 534	$ 435	1,054	897	1,887
Interest cost	287	352	570	711	1,431
Benefits paid			(900)		(1,762)
Actuarial (gain) loss			(738)		7,194
Foreign exchange (gain) loss			(1,481)		(1,157)
Benefit obligation—end of period	67,984		67,984		69,479
Less: Current portion	(1,779)		(1,779)		(1,811)
Non-current portion of benefit obligation	66,205		66,205		67,668
CDT defined benefit plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation—beginning of period			35,836	32,651	32,651
Service cost	144	136	286	277	550
Interest cost	115	159	229	324	642
Benefits paid			(313)		(626)
Actuarial (gain) loss			90		3,365
Foreign exchange (gain) loss			(907)		(746)
Benefit obligation—end of period	35,221		35,221		35,836
Less: Current portion	(700)		(700)		(675)
Non-current portion of benefit obligation	34,521		34,521		35,161
GXS GER defined benefit plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation—beginning of period			26,739	25,382	25,382
Service cost	80	140	159	285	566
Interest cost	84	121	168	247	489
Benefits paid			(472)		(996)
Actuarial (gain) loss			(269)		1,872
Foreign exchange (gain) loss			(675)		(574)
Benefit obligation—end of period	25,650		25,650		26,739
Less: Current portion	(986)		(986)		(1,012)
Non-current portion of benefit obligation	24,664		24,664		25,727
GXS PHP defined benefit plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation—beginning of period			6,904	3,853	3,853
Service cost	310	159	609	335	771
Interest cost	88	$ 72	173	$ 140	300
Benefits paid			(115)		(140)
Actuarial (gain) loss			(559)		1,957
Foreign exchange (gain) loss			101		163
Benefit obligation—end of period	7,113		7,113		6,904
Less: Current portion	(93)		(93)		(124)
Non-current portion of benefit obligation	$ 7,020		$ 7,020		$ 6,780

Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan.

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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