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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, 2018
Sep. 30, 2017
Jun. 30, 2018
Assumptions:      
Net pension expense $ 1,145 $ 1,035  
Pension Plan      
Assumptions:      
Service cost 462 460 $ 1,805
Interest cost 359 326 1,337
Amortization of actuarial (gains) and losses 69 91  
Net pension expense 890 877  
Pension Plan | CDT defined benefit plan      
Assumptions:      
Service cost 141 124 501
Interest cost 165 150 607
Amortization of actuarial (gains) and losses 176 134  
Net pension expense 482 408  
Pension Plan | GXS GER defined benefit plan      
Assumptions:      
Service cost 145 117 472
Interest cost 126 121 489
Amortization of actuarial (gains) and losses 33 18  
Net pension expense 304 256  
Pension Plan | GXS PHP defined benefit plan      
Assumptions:      
Service cost 176 219 832
Interest cost 68 55 $ 241
Amortization of actuarial (gains) and losses (140) (61)  
Net pension expense $ 104 $ 213