Note 7 - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015	Aug. 31, 2015
UNITED STATES
Revenues from clients	$ 193,166	$ 172,070	$ 565,063	$ 502,271
Segment operating profit	42,020	43,332	127,479	130,271
Total assets	696,832	433,177	696,832	433,177
Capital expenditures	6,060	2,977	29,133	13,808
Europe [Member]
Revenues from clients	70,243	63,156	206,198	186,320
Segment operating profit	33,304	31,187	95,536	85,675
Total assets	264,910	232,171	264,910	232,171
Capital expenditures	913	142	2,181	350
Asia Pacific [Member]
Revenues from clients	24,092	19,296	68,540	56,399
Segment operating profit	13,966	10,837	38,927	30,319
Total assets	77,233	62,728	77,233	62,728
Capital expenditures	1,260	508	3,357	1,233
Revenues from clients	287,501	254,522	839,801	744,990
Segment operating profit	89,290	85,356	261,942	246,265
Total assets	1,038,975	728,076	1,038,975	728,076	$ 736,671
Capital expenditures	$ 8,233	$ 3,627	$ 34,671	$ 15,391