Note 15 - Related Party Transactions (Detail) - Related Party Transactions with Unconsolidated Entities (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Revenue from unconsolidated entities $ 14,722 $ 5,587
Westinghouse [Member]
   
Revenue from unconsolidated entities 9,761 1,731
Other Entities[Member]
   
Revenue from unconsolidated entities $ 4,961 $ 3,856