Note 7 - Segment Information (Details Textual) $ in Thousands	9 Months Ended
May 31, 2017 USD ($)	Aug. 31, 2016 USD ($)
Number of Operating Segments	3
Goodwill	$ 695,667	$ 452,915
UNITED STATES
Goodwill	$ 385,713	367,480
Goodwill Percentage Per Segment	55.00%
Europe [Member]
Goodwill	$ 307,003	82,280
Goodwill Percentage Per Segment	44.00%
Asia Pacific [Member]
Goodwill	$ 2,951	$ 3,155
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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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

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