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Postretirement and Other Employee Benefits (Benefit Obligations and Plan Assets, Changes in Benefit Obligation and Plan Assets and Funded Status of Plans) (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Beginning projected benefit obligation $ 182,278 $ 161,230  
Service cost 1,068 883 $ 1,054
Interest cost 2,942 4,844 5,554
Actuarial (gain) loss (10,147) 40,170  
Settlements paid from plan assets (2,133)    
Total benefits paid (6,790) (5,587)  
Plan participants' contributions 27 27  
Terminations (106)    
Effect of conversion to U.S. dollars 575 (19,289)  
Ending projected benefit obligation 167,714 182,278 161,230
Change in plan assets      
Beginning fair value of plan assets 143,702 134,808  
Actual return on plan assets 2,582 29,734  
Settlements paid from plan assets (2,133)    
Employer contributions 6,981 3,391  
Benefits paid from plan assets (6,790) (5,587)  
Plan participants' contributions 27 27  
Effect of conversion to U.S. dollars (702) (18,990)  
Ending fair value of plan assets 146,698 143,702 $ 134,808
Unfunded status (21,016) (38,576)  
Amounts recognized in the Consolidated Balance Sheets      
Accrued benefit liability, current 182 383  
Accrued benefit liability, noncurrent 20,834 38,193  
Accumulated other comprehensive loss (income)      
Actuarial loss (gain), net of tax [1] 32,247 [2] 44,155  
Prior service credit, net of tax [1] (1,185) [2] (1,255)  
Excluding Cash Payments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total benefits paid (3,759) (5,268)  
Change in plan assets      
Benefits paid from plan assets $ (3,759) $ (5,268)  
[1]

We anticipate amortizing $ 1.1 million and $ (0.1) million , net of tax, of net actuarial loss and prior service credit balances, respectively, to net periodic cost in fiscal year 2018 .

[2]

(1)   We anticipate amortizing $ 1.1 million and $ (0.1) million , net of tax, of net actuarial loss and prior service credit balances, respectively, to net periodic cost in fiscal year 2018 .