Note 15 - Related Party Transactions (Detail) - Related Party Balances with Unconsolidated Entities (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2012
Aug. 31, 2012
Costs and estimated earnings in excess of billings on uncompleted contracts from unconsolidated entities $ 446,154 $ 492,563
Westinghouse [Member]
    
Accounts and other receivables from unconsolidated entities 169 266
Costs and estimated earnings in excess of billings on uncompleted contracts from unconsolidated entities 66,051 57,982
Advances to unconsolidated entities   19
Other Entities[Member]
    
Accounts and other receivables from unconsolidated entities 2,961 3,994
Costs and estimated earnings in excess of billings on uncompleted contracts from unconsolidated entities 1,739 1,322
Advances to unconsolidated entities 0  
Unconsolidated Subsidiaries [Member]
    
Accounts and other receivables from unconsolidated entities 3,130 4,260
Costs and estimated earnings in excess of billings on uncompleted contracts from unconsolidated entities 67,790 59,304
Advances to unconsolidated entities   $ 19