Restructuring and Related Charges - Liability Activity, Primarily Associated with 2017 Restructuring Plan (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance			$ 38,388
Restructuring and related charges	$ 12,647	$ 32,700	29,462	$ 113,529
Asset write-off charge and other non-cash activity			(14,351)
Cash payments			(29,221)
Liability, Ending Balance	24,278		24,278
Employee severance and benefit costs
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance			33,580
Restructuring and related charges	5,058	18,171	11,048	46,654
Asset write-off charge and other non-cash activity			(56)
Cash payments			(25,512)
Liability, Ending Balance	19,060		19,060
Lease costs
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance			1,665
Restructuring and related charges	1,589	1,151	1,596	5,600
Asset write-off charge and other non-cash activity			525
Cash payments			(437)
Liability, Ending Balance	3,349		3,349
Asset write-off costs
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance			0
Restructuring and related charges	5,575	$ 11,838	14,838	$ 58,613
Asset write-off charge and other non-cash activity			(14,838)
Cash payments			0
Liability, Ending Balance	0		0
Other Related Costs
Restructuring Reserve [Roll Forward]
Liability, Beginning Balance			3,143
Restructuring and related charges			1,980
Asset write-off charge and other non-cash activity			18
Cash payments			(3,272)
Liability, Ending Balance	$ 1,869		$ 1,869