Note 5 - Accounts Receivable, Concentrations of Credit Risk and Inventories (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Nov. 30, 2011
Aug. 31, 2011
Local Government Entity [Member]
   
Accounts Receivable, Gross, Current $ 9.0 $ 9.0
Individual [Member]
   
Accounts Receivable, Gross 159.1 227.1
Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected within One Year 169.6  
Increase (Decrease) in Accounts Receivable 68.0  
Accounts Receivable, Net 159.1 227.1
Government [Member]
   
Accounts Receivable, Net 82.3 64.3
Costs in Excess of Billings on Uncompleted Contracts or Programs $ 236.9 $ 278.6