XML 51 R34.htm IDEA: XBRL DOCUMENT v2.4.0.6
Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Nov. 30, 2012
item
Nov. 30, 2011
item
Long-term debt    
Outstanding amount $ 128.6 $ 134.4
Long-term line of credit | CoBank, ACB
   
Long-term debt    
Maximum borrowing capacity 60.8  
Additional borrowing under line of credit, which can be utilized for either short-term or long-term borrowing purposes 50.0  
Amount outstanding 64.1 70.1
Additional line of credit outstanding   15.1
Unused borrowing capacity which can be utilized for short-term borrowings 46.7 25.6
Term Loans from Insurance Companies
   
Long-term debt    
Outstanding amount 50.0 50.0
Pollution Control and Industrial Development Revenue Bonds
   
Long-term debt    
Outstanding amount $ 78.6 $ 84.4
Number of bond issuances 4 5