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Pension Benefit Obligations (Details 2)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
USD ($)
plan
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
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 $ (12,953) $ 24,161 $ 14,582
Multiemployer Pension Plans      
Multiemployer Pension Plans      
Number of minimum construction-industry pension plans participated | plan 200    
Aggregate contributions to plans $ 54,500    
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 6,900 7,600 2,600
United States Pension Plan of US Entity, Defined Benefit      
Components of net periodic (benefit) cost:      
Service costs 6,800    
Interest cost on projected benefit obligation 28,200 7,800 6,600
Expected return on plan assets (29,400) (8,600) (8,500)
Amortization of net loss 4,300 4,000 4,300
Settlement loss recognized 600    
Net periodic cost 10,500 3,200 2,400
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 (4,000)    
Total (4,000)    
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets      
Projected benefit obligation 692,500 217,000 180,300
Accumulated benefit obligation 686,500 217,000 180,300
Fair values of plan assets 455,600 $ 139,700 $ 119,800
Expected employer contributions in next fiscal year 10,800    
Minimum contribution for one of the plans 1,300    
Expected future benefit payments      
2016 40,600    
2017 41,000    
2018 40,600    
2019 41,400    
2020 42,800    
2021-2025 217,000    
Total $ 423,400    
Weighted-average assumptions to determine benefit obligation:      
Discount rate (as a percent) 4.10% 4.00% 4.40%
Salary increase rate (as a percent) 3.81%    
Weighted-average assumptions to determine net periodic benefit cost:      
Discount rate (as a percent) 3.88% 4.40% 3.50%
Salary increase rate (as a percent) 4.50%    
Expected long-term rate of return on plan assets (as a percent) 6.73% 7.50% 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) 39.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 37.00% 58.00%  
United States Pension Plan of US Entity, Defined Benefit | Debt Securities      
Target Allocations by Asset Category      
Target Allocations by Asset Category (as a percent) 57.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 59.00% 31.00%  
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) 3.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 3.00% 10.00%  
Foreign Pension Plan, Defined Benefit      
Components of net periodic (benefit) cost:      
Service costs $ 1,100 $ 700 $ 900
Interest cost on projected benefit obligation 47,100 27,900 23,800
Expected return on plan assets (49,400) (26,100) (22,700)
Amortization of prior service cost (200) (200) (200)
Amortization of net loss 5,900 4,900 4,000
Settlement loss recognized 700 400 2,600
Net periodic cost 5,200 7,600 8,500
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 (5,700)    
Total (5,500)    
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets      
Projected benefit obligation 1,226,200 658,500 601,700
Accumulated benefit obligation 1,222,000 656,300 599,800
Fair values of plan assets 911,200 $ 513,400 $ 469,000
Expected employer contributions in next fiscal year 20,700    
Expected future benefit payments      
2016 37,400    
2017 41,200    
2018 44,400    
2019 41,400    
2020 43,100    
2021-2025 242,500    
Total $ 450,000    
Weighted-average assumptions to determine benefit obligation:      
Discount rate (as a percent) 3.80% 3.94% 4.44%
Salary increase rate (as a percent) 2.51% 2.38% 2.58%
Weighted-average assumptions to determine net periodic benefit cost:      
Discount rate (as a percent) 3.92% 4.44% 4.39%
Salary increase rate (as a percent) 2.65% 2.58% 2.36%
Expected long-term rate of return on plan assets (as a percent) 6.00% 5.40% 5.11%
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) 30.00%    
Percentage of Plan Assets by Asset Category      
Plan Assets by Asset Category (as a percent) 27.00% 28.00%  
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) 30.00% 33.00%  
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) 4.00% 3.00%  
Foreign Pension Plan, Defined Benefit | Property and Other      
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) 39.00% 36.00%