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Restructuring and Related Charges (Liability Activity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Restructuring Reserve [Roll Forward]      
Restructuring related charges $ 25,914 $ 36,902 $ 160,395
Employee severance and benefit costs      
Restructuring Reserve [Roll Forward]      
Restructuring related charges 16,029 16,269 56,834
Lease costs      
Restructuring Reserve [Roll Forward]      
Restructuring related charges (41) 1,596 3,966
Asset write-off costs      
Restructuring Reserve [Roll Forward]      
Restructuring related charges (3,566) 16,264 94,346
2017 Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Balance as of beginning of period 21,337 38,388  
Restructuring related charges 14,493 36,902  
Asset write-off charge and other non-cash activity 3,054 (15,841)  
Cash payments (32,953) (38,112)  
Balance as of end of period 5,931 21,337 38,388
2017 Restructuring Plan | Employee severance and benefit costs      
Restructuring Reserve [Roll Forward]      
Balance as of beginning of period 18,131 33,580  
Restructuring related charges 16,029 16,269  
Asset write-off charge and other non-cash activity (494) (127)  
Cash payments (30,504) (31,591)  
Balance as of end of period 3,162 18,131 33,580
2017 Restructuring Plan | Lease costs      
Restructuring Reserve [Roll Forward]      
Balance as of beginning of period 2,684 1,665  
Restructuring related charges (41) 1,596  
Asset write-off charge and other non-cash activity 0 525  
Cash payments (663) (1,102)  
Balance as of end of period 1,980 2,684 1,665
2017 Restructuring Plan | Asset write-off costs      
Restructuring Reserve [Roll Forward]      
Balance as of beginning of period 0 0  
Restructuring related charges (3,566) 16,264  
Asset write-off charge and other non-cash activity 3,566 (16,264)  
Cash payments 0 0  
Balance as of end of period 0 0 0
2017 Restructuring Plan | Other Related Costs      
Restructuring Reserve [Roll Forward]      
Balance as of beginning of period 522 3,143  
Restructuring related charges 2,071 2,773  
Asset write-off charge and other non-cash activity (18) 25  
Cash payments (1,786) (5,419)  
Balance as of end of period $ 789 $ 522 $ 3,143