Note 9 - Goodwill (Details) - Changes in the Carrying Amount of Goodwill by Segment (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 31, 2014
Goodwill [Line Items]
Balance	$ 244,573
Goodwill acquired during the period	37,143
Foreign currency translations	5,571
Balance	287,287
United States [Member]
Goodwill [Line Items]
Balance	167,822
Goodwill acquired during the period	11,612
Foreign currency translations	0
Balance	179,434
Europe [Member]
Goodwill [Line Items]
Balance	73,424
Goodwill acquired during the period	25,531
Foreign currency translations	5,690
Balance	104,645
Asia Pacific [Member]
Goodwill [Line Items]
Balance	3,327
Goodwill acquired during the period	0
Foreign currency translations	(119)
Balance	$ 3,208