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Pension Benefit Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Change in benefit obligation:      
Aggregate pension deficit $ 550,900   $ 572,600
Long-term portion of aggregate pension deficit 544,112   $ 565,254
United States Pension Plan of US Entity, Defined Benefit      
Components of net periodic (benefit) cost:      
Service costs 1,800 $ 1,500  
Interest cost on projected benefit obligation 5,700 6,400  
Expected return on plan assets (7,800) (6,700)  
Amortization of net loss 1,000 1,100  
Curtailment gain recognized (6,800)    
Settlement (gain) loss recognized (1,000)    
Net periodic (benefit) cost (7,100) 2,300  
Change in benefit obligation:      
Employer contributions 5,700    
Expected employer contributions in next fiscal year 9,200    
Foreign Pension Plan, Defined Benefit      
Components of net periodic (benefit) cost:      
Service costs 300 300  
Interest cost on projected benefit obligation 10,500 11,300  
Expected return on plan assets (12,800) (11,900)  
Amortization of prior service cost (100) (100)  
Amortization of net loss 1,400 1,500  
Settlement (gain) loss recognized 100 400  
Net periodic (benefit) cost (600) $ 1,500  
Change in benefit obligation:      
Employer contributions 5,400    
Expected employer contributions in next fiscal year $ 15,500