Note 10 - Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	May 31, 2019	Aug. 31, 2018
Gross Carrying Amount	$ 244,556	$ 248,289
Accumulated Amortization	115,351	99,354
Net Carrying Amount	129,205	148,935
Data Content [Member]
Gross Carrying Amount	32,922	33,992
Accumulated Amortization	21,537	20,990
Net Carrying Amount	11,385	13,002
Customer Relationships [Member]
Gross Carrying Amount	96,713	98,882
Accumulated Amortization	34,118	29,387
Net Carrying Amount	62,595	69,495
Computer Software, Intangible Asset [Member]
Gross Carrying Amount	106,085	106,505
Accumulated Amortization	53,813	44,231
Net Carrying Amount	52,272	62,274
Noncompete Agreements [Member]
Gross Carrying Amount	4,815	4,840
Accumulated Amortization	2,977	2,381
Net Carrying Amount	1,838	2,459
Trade Names [Member]
Gross Carrying Amount	4,021	4,070
Accumulated Amortization	2,906	2,365
Net Carrying Amount	$ 1,115	$ 1,705