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Pension Benefit Obligations - Pension Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Components of net periodic (benefit) cost:      
Amount, net of applicable deferred income taxes, included in other comprehensive income arising from a change in net prior service cost and net gain/loss $ 164,911 $ (12,953) $ 24,161
Pension Plan, Defined Benefit      
Components of net periodic (benefit) cost:      
Amount, net of applicable deferred income taxes, included in other comprehensive income arising from a change in net prior service cost and net gain/loss 26,200 6,900 7,600
United States Pension Plan of US Entity, Defined Benefit      
Components of net periodic (benefit) cost:      
Service costs 4,300 6,800  
Interest cost on projected benefit obligation 22,000 28,200 7,800
Expected return on plan assets (30,800) (29,400) (8,600)
Amortization of net loss 4,000 4,300 4,000
Curtailment gain recognized (6,800)    
Settlement (gain) loss recognized (900) 600  
Net periodic (benefit) cost (8,200) 10,500 3,200
Amounts included in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during the next fiscal year      
Amortization of net actuarial losses (4,300)    
Total (4,300)    
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets      
Projected benefit obligation 694,800 692,500 217,000
Accumulated benefit obligation 694,800 686,500 217,000
Fair values of plan assets 453,200 $ 455,600 $ 139,700
Expected employer contributions in next fiscal year 9,800    
Minimum contribution for one of the plans 400    
Expected future benefit payments      
2017 40,600    
2018 41,300    
2019 40,900    
2020 41,900    
2021 42,000    
2022-2026 207,500    
Total $ 414,200    
Weighted-average assumptions to determine benefit obligation:      
Discount rate (as a percent) 3.41% 4.10% 4.00%
Salary increase rate (as a percent)   3.81%  
Weighted-average assumptions to determine net periodic benefit cost:      
Discount rate (as a percent) 4.10% 3.88% 4.40%
Salary increase rate (as a percent)   4.50%  
Expected long-term rate of return on plan assets (as a percent) 6.72% 6.73% 7.50%
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 100.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 100.00% 100.00%  
United States Pension Plan of US Entity, Defined Benefit | Equity Securities      
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 42.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 42.00% 37.00%  
United States Pension Plan of US Entity, Defined Benefit | Debt Securities      
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 48.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 49.00% 59.00%  
United States Pension Plan of US Entity, Defined Benefit | Cash and Cash Equivalents      
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 1.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 1.00% 1.00%  
United States Pension Plan of US Entity, Defined Benefit | Property and Other      
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 9.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 8.00% 3.00%  
Foreign Pension Plan, Defined Benefit      
Components of net periodic (benefit) cost:      
Service costs $ 1,000 $ 1,100 $ 700
Interest cost on projected benefit obligation 39,200 47,100 27,900
Expected return on plan assets (48,000) (49,400) (26,100)
Amortization of prior service credits (200) (200) (200)
Amortization of net loss 5,400 5,900 4,900
Settlement (gain) loss recognized 100 700 400
Net periodic (benefit) cost (2,500) 5,200 7,600
Amounts included in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during the next fiscal year      
Amortization of prior service credit (200) (200) (200)
Amortization of net actuarial losses (13,400)    
Total (13,200)    
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets      
Projected benefit obligation 1,220,300 1,226,200 658,500
Accumulated benefit obligation 1,215,700 1,222,000 656,300
Fair values of plan assets 782,100 $ 911,200 $ 513,400
Expected employer contributions in next fiscal year 24,000    
Expected future benefit payments      
2017 38,900    
2018 39,300    
2019 42,100    
2020 42,100    
2021 44,200    
2022-2026 240,200    
Total $ 446,800    
Weighted-average assumptions to determine benefit obligation:      
Discount rate (as a percent) 2.35% 3.80% 3.94%
Salary increase rate (as a percent) 2.61% 2.51% 2.38%
Weighted-average assumptions to determine net periodic benefit cost:      
Discount rate (as a percent) 3.80% 3.92% 4.44%
Salary increase rate (as a percent) 2.65% 2.65% 2.58%
Expected long-term rate of return on plan assets (as a percent) 5.74% 6.00% 5.40%
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 100.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 100.00% 100.00%  
Foreign Pension Plan, Defined Benefit | Equity Securities      
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 28.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 28.00% 27.00%  
Foreign Pension Plan, Defined Benefit | Debt Securities      
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 30.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 34.00% 30.00%  
Foreign Pension Plan, Defined Benefit | Cash and Cash Equivalents      
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 10.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 7.00% 4.00%  
Foreign Pension Plan, Defined Benefit | Property and Other      
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 32.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 31.00% 39.00%