Segment Information - Reconciliation of Earnings from Operations to Earnings Before Income Tax and Earnings (Loss) from Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	3 Months Ended
Nov. 30, 2018	Nov. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Earnings from operations	$ 36,454	$ 61,442
Interest and foreign exchange	4,404	7,020
Earnings before income tax and earnings (loss) from unconsolidated affiliates	$ 32,050	$ 54,422

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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