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Equities Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Aug. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss $ (159,235) $ (226,735) $ (159,235) $ (226,735) $ (156,867)
Other Comprehensive Income (Loss), Net of Tax 6,198 3,598 (2,368) 5,852  
Accumulated Defined Benefit Plans Adjustment [Member]
         
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss (154,131)   (154,131)   (165,611)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     772    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     10,708    
Other Comprehensive Income (Loss), Net of Tax     11,480    
Accumulated Translation Adjustment [Member]
         
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss (6,144)   (6,144)   (5,311)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (1,520)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     687    
Other Comprehensive Income (Loss), Net of Tax     (833)    
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
         
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss (2,850)   (2,850)   11,685
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (6,139)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     (8,396)    
Other Comprehensive Income (Loss), Net of Tax     (14,535)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]
         
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss 3,890   3,890   2,370
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     1,520    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     0    
Other Comprehensive Income (Loss), Net of Tax     1,520    
Accumulated Other Comprehensive Income (Loss) [Member]
         
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (5,367)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     2,999    
Other Comprehensive Income (Loss), Net of Tax     $ (2,368)