Note 7 - Equity Method Investments and Variable Interest Entities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Noncontrolling Interest, Decrease from Deconsolidation   $ (10,662)
Revenues 1,517,603 1,543,282
Asset decrease [Member]
   
Noncontrolling Interest, Decrease from Deconsolidation 56,300  
Consolidated Entities [Member]
   
Revenues 206,000 153,200
Liability decrease [Member]
   
Noncontrolling Interest, Decrease from Deconsolidation $ 35,200