Restructuring and Related Charges (Liability Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	$ 38,388	$ 18,027
Restructuring and related charges	36,902	160,395	$ 11,369
Asset write-off charge and other non-cash activity	(15,841)	(92,903)
Cash payments	(38,112)	(47,131)
Balance as of end of period	21,337	38,388	18,027
Employee severance and benefit costs
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	33,580	17,266
Restructuring and related charges	16,269	56,834	8,845
Asset write-off charge and other non-cash activity	(127)	1,319
Cash payments	(31,591)	(41,839)
Balance as of end of period	18,131	33,580	17,266
Lease costs
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	1,665	21
Restructuring and related charges	1,596	3,966	(43)
Asset write-off charge and other non-cash activity	525	59
Cash payments	(1,102)	(2,381)
Balance as of end of period	2,684	1,665	21
Asset write-off costs
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	0	0
Restructuring and related charges	16,264	94,346	1,170
Asset write-off charge and other non-cash activity	(16,264)	(94,346)
Cash payments	0	0
Balance as of end of period	0	0	0
Other Related Costs
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	3,143	740
Restructuring and related charges	2,773	5,249
Asset write-off charge and other non-cash activity	25	65
Cash payments	(5,419)	(2,911)
Balance as of end of period	$ 522	$ 3,143	$ 740