Note 11 - Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	May 31, 2017	Aug. 31, 2016
Gross Carrying Amount	$ 243,850	$ 148,984
Accumulated Amortization	68,316	55,823
Net Carrying Amount	175,534	93,161
Data Content [Member]
Gross Carrying Amount	33,393	34,167
Accumulated Amortization	17,917	16,758
Net Carrying Amount	15,476	17,409
Customer Relationships [Member]
Gross Carrying Amount	97,322	45,185
Accumulated Amortization	20,291	16,480
Net Carrying Amount	77,031	28,705
Computer Software, Intangible Asset [Member]
Gross Carrying Amount	104,315	62,560
Accumulated Amortization	27,445	20,545
Net Carrying Amount	76,870	42,015
Noncompete Agreements [Member]
Gross Carrying Amount	4,779	4,344
Accumulated Amortization	1,303	1,118
Net Carrying Amount	3,476	3,226
Trade Names [Member]
Gross Carrying Amount	4,041	2,728
Accumulated Amortization	1,360	922
Net Carrying Amount	$ 2,681	$ 1,806