SEGMENT REPORTING - Net Revenues by Type of Work (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2011	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Segment Reporting Information [Line Items]
Net revenues	$ 7,086,667	$ 7,198,140	$ 7,058,042	$ 7,219,961	$ 6,835,893	$ 7,154,690	$ 6,797,250	$ 7,074,497	$ 28,562,810	$ 27,862,330	$ 25,507,036
Reimbursements	438,327	509,795	435,278	448,075	452,366	486,100	462,578	514,611	1,831,475	1,915,655	1,845,878
Revenues	7,524,994	7,707,935	7,493,320	7,668,036	7,288,259	7,640,790	7,259,828	7,589,108	30,394,285	29,777,985	27,352,914
Consulting
Segment Reporting Information [Line Items]
Net revenues									15,383,485	15,562,321	14,924,187
Outsourcing
Segment Reporting Information [Line Items]
Net revenues									$ 13,179,325	$ 12,300,009	$ 10,582,849