Derivative Financial Instruments and Hedging Activities - Schedule of Derivative Instruments, Effect on Earnings (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
Nov. 30, 2018	Nov. 30, 2017
Derivative [Line Items]
Gain (loss) on fair value hedging relationship	$ 0	$ 0
Interest Expense \| Interest rate swap derivatives
Derivative [Line Items]
Gain (loss) on fair value hedging relationship	(955)	(8,317)
Interest Expense \| Hedged Item
Derivative [Line Items]
Gain (loss) on fair value hedging relationship	$ 955	$ 8,317

Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

Name:	us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration