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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Aug. 31, 2012
Aug. 31, 2010
Aug. 31, 2011
Aug. 31, 2002
Year 2002 [Member]
Aug. 31, 2003
Year 2003 [Member]
Aug. 31, 2004
Year 2004 [Member]
Aug. 31, 2012
Year 2009 [Member]
Aug. 31, 2009
Year 2009 [Member]
Aug. 31, 2011
Year 2011 [Member]
Aug. 31, 2012
Year 2012 [Member]
Income Taxes [Line Items]                    
Operating loss carryforward generated (utilized)         $ 33.3 $ 21.2 $ (6.5) $ 9.7    
Operating loss carryforwards             3.2      
Deductions to total loss carryforward             1.6      
Income tax credit carryforward generated (utilized)       2.2         3.5 2.7
Foreign tax credit, valuation allowance       2.2            
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 3.1   2.8              
Net operating loss carryforward included in the gross unrecognized tax benefit 3.2                  
Increase (decrease) in income tax expense due to interest and penalties related to uncertain tax positions 0.1 (0.1)                
Balance of interest and penalties related to uncertain tax positions 0.2   0.1              
Expected increase in unrecognized tax benefit $ 0.3