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Financial Derivatives (Tables)
6 Months Ended
Feb. 29, 2012
Financial Derivatives [Abstract]  
Schedule Of Derivative Instruments Statements Of Financial Performance And Financial Position, Location
  Fair Values of Derivative Instruments
Asset (Liability) Derivatives
 
    February 29,   February 28,     August 31,  
$ in thousands Balance Sheet Location   2012     2011     2011  
Derivatives designated as hedging                    
instruments:                    
Foreign currency option contract Other current assets $ 4   $ -   $ -  
Foreign currency forward contracts Other current liabilities   (641 )   (388 )   (218 )
Interest rate swap Other current liabilities   (180 )   (354 )   (267 )
Interest rate swap Other noncurrent liabilities   (43 )   (271 )   (149 )
Total derivatives designated as hedging                    
instruments   $ (860 ) $ (1,013 ) $ (634 )
 
Derivatives not designated as hedging                    
instruments:                    
Foreign currency forward contracts Other current liabilities $ (34 ) $ -   $ -  
Total derivatives not designated as                    
hedging instruments   $ (34 ) $ -   $ -  
Schedule Of Derivative Instruments, Effect On Other Comprehensive Income (Loss)