Stock Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
Nov. 30, 2019	Nov. 30, 2018
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Stock based compensation expense	$ 3,157	$ 3,194

Amount of noncash expense for share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration