Income Taxes - Net Operating Loss Carryforwards and Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	Aug. 31, 2016	Aug. 31, 2015
Operating Loss Carryforwards [Line Items]
Total unused net operating loss carryforwards	$ 221,567
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits	0	$ 0
U.S. Federal
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	11,578
Foreign
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	107,540
Net operating loss carryforwards (expiring over the next 5 years)	8,018
Net operating loss carryforwards (expiring in more than 5 years)	$ 94,431