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Equities Accumulated Other Comprehensive Income (Details) (USD $)
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss $ (156,757,000) $ (156,867,000)  
Other Comprehensive Income (Loss), Net of Tax 110,000 75,720,000 (43,130,000)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss 4,398,000 2,370,000 1,391,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 2,028,000 979,000  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0  
Other Comprehensive Income (Loss), Net of Tax 2,028,000 979,000  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss (2,722,000) 11,685,000 (3,806,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (6,011,000) 15,491,000  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (8,396,000) 0  
Other Comprehensive Income (Loss), Net of Tax (14,407,000) 15,491,000  
Accumulated Translation Adjustment [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss (6,581,000) (5,311,000) (1,445,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (1,957,000) (3,866,000)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 687,000 0  
Other Comprehensive Income (Loss), Net of Tax (1,270,000) (3,866,000)  
Accumulated Other Comprehensive Loss
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss (156,757,000) (156,867,000) (232,587,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (6,030,000) 59,075,000  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 6,140,000 16,645,000  
Other Comprehensive Income (Loss), Net of Tax 110,000 75,720,000 (43,130,000)
Accumulated Defined Benefit Plans Adjustment [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss (151,852,000) (165,611,000) (228,727,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (90,000) 46,471,000  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 13,849,000 16,645,000  
Other Comprehensive Income (Loss), Net of Tax 13,759,000 63,116,000  
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 $ 13,500,000