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Equities Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ (214,207) $ (156,757)    
Other Comprehensive Income (Loss), Net of Tax (57,450) 110 $ 75,720  
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss 4,156 4,398 2,370 $ 1,391
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (242) 2,028 979  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0 0  
Other Comprehensive Income (Loss), Net of Tax (242) 2,028 979  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (5,324) (2,722) 11,685 (3,806)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (3,394) (6,011) 15,491  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 792 (8,396) 0  
Other Comprehensive Income (Loss), Net of Tax (2,602) (14,407) 15,491  
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (41,310) (6,581) (5,311) (1,445)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (34,729) (1,957) (3,866)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 687 0  
Other Comprehensive Income (Loss), Net of Tax (34,729) (1,270) (3,866)  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (214,207) (156,757) (156,867) (232,587)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (71,603) (6,030) 59,075  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 14,153 6,140 16,645  
Other Comprehensive Income (Loss), Net of Tax (57,450) 110 75,720  
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (171,729) (151,852) (165,611) $ (228,727)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (33,238) (90) 46,471  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 13,361 13,849 16,645  
Other Comprehensive Income (Loss), Net of Tax $ (19,877) 13,759 $ 63,116  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Gain on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring   $ 13,500