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Pension Plans and Other Post Retirement Benefits - Schedule of the Change in Benefit Obligation (Details) - Pension Plan - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation—beginning of period $ 61,886 $ 57,106 $ 57,106
Service cost 462 460 1,805
Interest cost 359 326 1,337
Benefits paid (441)   (1,695)
Actuarial (gain) loss (1,512)   2,126
Foreign exchange (gain) loss 551   1,207
Benefit obligation—end of period 61,305   61,886
Less: Current portion (1,850)   (1,820)
Non-current portion of benefit obligation 59,455   60,066
CDT defined benefit plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation—beginning of period 32,651 28,881 28,881
Service cost 141 124 501
Interest cost 165 150 607
Benefits paid (154)   (580)
Actuarial (gain) loss (477)   2,442
Foreign exchange (gain) loss 342   800
Benefit obligation—end of period 32,668   32,651
Less: Current portion (673)   (655)
Non-current portion of benefit obligation 31,995   31,996
GXS GER defined benefit plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation—beginning of period 25,382 23,730 23,730
Service cost 145 117 472
Interest cost 126 121 489
Benefits paid (253)   (974)
Actuarial (gain) loss (460)   997
Foreign exchange (gain) loss 266   668
Benefit obligation—end of period 25,206   25,382
Less: Current portion (1,039)   (1,027)
Non-current portion of benefit obligation 24,167   24,355
GXS PHP defined benefit plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation—beginning of period 3,853 4,495 4,495
Service cost 176 219 832
Interest cost 68 $ 55 241
Benefits paid (34)   (141)
Actuarial (gain) loss (575)   (1,313)
Foreign exchange (gain) loss (57)   (261)
Benefit obligation—end of period 3,431   3,853
Less: Current portion (138)   (138)
Non-current portion of benefit obligation $ 3,293   $ 3,715