Note 9 - Goodwill - Changes in the Carrying Amount of Goodwill by Segment (Details) $ in Thousands	6 Months Ended
Feb. 28, 2018 USD ($)
Begining Balance	$ 707,560
Foreign currency translations	11,553
Other adjustments	(2,201)
Ending Balance	716,912
UNITED STATES
Begining Balance	386,835
Foreign currency translations
Other adjustments	(640)
Ending Balance	386,195
Europe [Member]
Begining Balance	317,759
Foreign currency translations	11,460
Other adjustments	(1,561)
Ending Balance	327,658
Asia Pacific [Member]
Begining Balance	2,966
Foreign currency translations	93
Other adjustments
Ending Balance	$ 3,059

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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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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