Note 8 - Segment Information (Details Textual) $ in Thousands	3 Months Ended
Feb. 28, 2019 USD ($)	Aug. 31, 2018 USD ($)
Number of Reportable Segments	3
Goodwill, Ending Balance	$ 700,029	$ 701,833
UNITED STATES
Goodwill, Ending Balance	$ 386,195	386,195
Goodwill Percentage Per Segment	55.00%
Europe [Member]
Goodwill, Ending Balance	$ 310,901	312,694
Goodwill Percentage Per Segment	44.00%
Asia Pacific [Member]
Goodwill, Ending Balance	$ 2,933	$ 2,944
Goodwill Percentage Per Segment	1.00%

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