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Equities Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2016
May 31, 2015
May 31, 2016
May 31, 2015
Aug. 31, 2015
Aug. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ (213,794) $ (160,267) $ (213,794) $ (160,267) $ (214,207) $ (156,757)
Other Comprehensive Income (Loss), Net of Tax 14,914 2,128 413 (3,510)    
Accumulated Defined Benefit Plans Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (161,923) (141,590) (161,923) (141,590) (171,729) (151,852)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     135 236    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     9,671 10,026    
Other Comprehensive Income (Loss), Net of Tax     9,806 10,262    
Accumulated Net Unrealized Investment Gain (Loss) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss 4,618 4,968 4,618 4,968 4,156 4,398
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     462 570    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     0 0    
Other Comprehensive Income (Loss), Net of Tax     462 570    
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss (9,269) (4,769) (9,269) (4,769) (5,324) (2,722)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (6,805) (2,418)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     2,860 371    
Other Comprehensive Income (Loss), Net of Tax     (3,945) (2,047)    
Accumulated Translation Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ (47,220) $ (18,876) (47,220) (18,876) $ (41,310) $ (6,581)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (6,380) (12,295)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     470 0    
Other Comprehensive Income (Loss), Net of Tax     (5,910) (12,295)    
Accumulated Other Comprehensive Income (Loss) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (12,588) (13,907)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     13,001 10,397    
Other Comprehensive Income (Loss), Net of Tax     $ 413 $ (3,510)