Note 9 - Goodwill (Details) - Changes in the Carrying Amount of Goodwill by Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2013
Goodwill [Line Items]
Balance	$ 244,573
Goodwill acquired during the period	11,173
Foreign currency translations	3,599
Balance	259,345
United States [Member]
Goodwill [Line Items]
Balance	167,822
Goodwill acquired during the period	11,173
Balance	178,995
Europe [Member]
Goodwill [Line Items]
Balance	73,424
Foreign currency translations	3,737
Balance	77,161
Asia Pacific [Member]
Goodwill [Line Items]
Balance	3,327
Foreign currency translations	(138)
Balance	$ 3,189