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Restructuring and Related Charges - Liability Activity, Primarily Associated with 2017 Restructuring Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Restructuring Reserve [Roll Forward]        
Liability, Beginning Balance     $ 38,388  
Restructuring and related charges $ 5,427 $ 44,927 16,815 $ 80,829
Asset write-off charge and other non-cash activity     (8,799)  
Cash payments     (21,071)  
Liability, Ending Balance 25,333   25,333  
Employee severance and benefit costs        
Restructuring Reserve [Roll Forward]        
Liability, Beginning Balance     33,580  
Restructuring and related charges 2,012 9,097 5,989 28,483
Asset write-off charge and other non-cash activity     442  
Cash payments     (18,703)  
Liability, Ending Balance 21,308   21,308  
Lease costs        
Restructuring Reserve [Roll Forward]        
Liability, Beginning Balance     1,665  
Restructuring and related charges 7 1,158 7 4,449
Asset write-off charge and other non-cash activity     0  
Cash payments     (125)  
Liability, Ending Balance 1,547   1,547  
Asset write-off costs        
Restructuring Reserve [Roll Forward]        
Liability, Beginning Balance     0  
Restructuring and related charges 2,451 $ 34,135 9,263 $ 46,775
Asset write-off charge and other non-cash activity     (9,263)  
Cash payments     0  
Liability, Ending Balance 0   0  
Other Related Costs        
Restructuring Reserve [Roll Forward]        
Liability, Beginning Balance     3,143  
Restructuring and related charges     1,556  
Asset write-off charge and other non-cash activity     22  
Cash payments     (2,243)  
Liability, Ending Balance $ 2,478   $ 2,478