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Pension and Post-Retirement Benefit Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
Change in benefit obligation:          
Aggregate pension deficit $ 592,100   $ 592,100   $ 221,300
Long-term portion of aggregate pension deficit 584,147   584,147   $ 220,742
United States Pension Plan of US Entity, Defined Benefit          
Components of net periodic (benefit) cost:          
Service costs 1,800   5,000    
Interest cost on projected benefit obligation 7,300 $ 1,900 21,000 $ 5,700  
Expected return on plan assets (7,600) (2,100) (21,900) (6,300)  
Amortization of net loss 1,100 1,000 3,300 3,000  
Net periodic cost 2,600 800 7,400 2,400  
Change in benefit obligation:          
Employer contributions     34,800    
Expected employer contributions in next fiscal year     2,800    
Foreign Pension Plan, Defined Benefit          
Components of net periodic (benefit) cost:          
Service costs 300 200 800 500  
Interest cost on projected benefit obligation 12,000 7,100 34,900 20,800  
Expected return on plan assets (12,500) (6,600) (36,700) (19,500)  
Amortization of prior service cost (100) (100) (100) (200)  
Amortization of net loss 1,400 1,200 4,500 3,700  
Settlement loss recognized     400    
Net periodic cost $ 1,100 $ 1,800 3,800 $ 5,300  
Change in benefit obligation:          
Employer contributions     17,300    
Expected employer contributions in next fiscal year     $ 6,300