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Pension Plans and Other Post Retirement Benefits - Components of Net Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Assumptions:      
Service cost $ 660   $ 2,409
Interest cost 289   1,467
Net pension expense 1,190 $ 1,167  
Pension Plan      
Assumptions:      
Service cost 660 637  
Interest cost 289 363  
Amortization of actuarial (gains) and losses 191 107  
Net pension expense 1,140 1,107  
Pension Plan | CDT      
Assumptions:      
Service cost 120 107 422
Interest cost 117 154 610
Amortization of actuarial (gains) and losses 160 107  
Net pension expense 397 368  
Pension Plan | GXS Germany      
Assumptions:      
Service cost 101 103 359
Interest cost 96 128 543
Amortization of actuarial (gains) and losses 43 0  
Net pension expense 240 231  
Pension Plan | GXS Philippines      
Assumptions:      
Service cost 439 427 1,628
Interest cost 76 81 $ 314
Amortization of actuarial (gains) and losses (12) 0  
Net pension expense $ 503 $ 508