Note 7 - Segment Information (Details) - Revenues From Countries That Are 10% Or More Of Revenues (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 31, 2014	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2014		Aug. 31, 2013		Aug. 31, 2012
Revenues*
Revenues by location	$ 238,664	$ 231,761	$ 226,934	$ 222,975	$ 219,332	$ 214,613	$ 213,083	$ 211,085	$ 920,335	[1]	$ 858,112	[1]	$ 805,793	[1]
UNITED STATES
Revenues*
Revenues by location									624,642	[1]	586,865	[1]	550,474	[1]
UNITED KINGDOM
Revenues*
Revenues by location									131,848	[1]	121,072	[1]	114,435	[1]
All Other European Countries [Member]
Revenues*
Revenues by location									95,547	[1]	87,755	[1]	82,969	[1]
Asia Pacific [Member]
Revenues*
Revenues by location									$ 68,298	[1]	$ 62,420	[1]	$ 57,915	[1]

[1] Revenues are attributed to countries based on the location of the client.