Note 9 - Goodwill - Changes in the Carrying Amount of Goodwill by Segment (Details) $ in Thousands	6 Months Ended
Feb. 28, 2019 USD ($)
Beginning Balance	$ 701,833
Foreign currency translations	(1,804)
Ending Balance	700,029
UNITED STATES
Beginning Balance	386,195
Foreign currency translations
Ending Balance	386,195
Europe [Member]
Beginning Balance	312,694
Foreign currency translations	(1,793)
Ending Balance	310,901
Asia Pacific [Member]
Beginning Balance	2,944
Foreign currency translations	(11)
Ending Balance	$ 2,933

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant