Restructuring and Related Charges - Liability Activity, Primarily Associated with 2017 Restructuring Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2018	Nov. 30, 2017
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance	$ 21,337
Restructuring and related charges	6,025	$ 11,388
Asset write-off charge and other non-cash activity	(462)
Cash payments	(10,976)
Liability, Ending Balance	15,924
Employee severance and benefit costs
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance	18,131
Restructuring and related charges	5,179	3,977
Asset write-off charge and other non-cash activity	(270)
Cash payments	(10,049)
Liability, Ending Balance	12,991
Lease costs
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance	2,684
Restructuring and related charges	9	0
Asset write-off charge and other non-cash activity	0
Cash payments	(157)
Liability, Ending Balance	2,536
Asset write-off costs
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance	0
Restructuring and related charges	184	$ 6,812
Asset write-off charge and other non-cash activity	(184)
Cash payments	0
Liability, Ending Balance	0
Other Related Costs
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance	522
Restructuring and related charges	653
Asset write-off charge and other non-cash activity	(8)
Cash payments	(770)
Liability, Ending Balance	$ 397