Note 10 - Goodwill - Changes in the Carrying Amount of Goodwill by Segment (Details) $ in Thousands	9 Months Ended
May 31, 2017 USD ($)
Begining Balance	$ 452,915
Goodwill acquired during the period	234,055
Foreign currency translations	8,697
Ending Balance	695,667
UNITED STATES
Begining Balance	367,480
Goodwill acquired during the period	18,233
Foreign currency translations
Ending Balance	385,713
Europe [Member]
Begining Balance	82,280
Goodwill acquired during the period	215,822
Foreign currency translations	8,901
Ending Balance	307,003
Asia Pacific [Member]
Begining Balance	3,155
Goodwill acquired during the period
Foreign currency translations	(204)
Ending Balance	$ 2,951

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

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