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Note 11 - Long-term Debt (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 0 Months Ended
May 31, 2014
Credit Agreement [Member]
Revolving Credit Facility [Member]
May 31, 2014
Credit Agreement [Member]
London Interbank Offered Rate (LIBOR) [Member]
May 31, 2014
Credit Agreement [Member]
Sep. 14, 2013
Floating Rate Note [Member]
London Interbank Offered Rate (LIBOR) [Member]
Sep. 14, 2013
Floating Rate Note [Member]
Note 11 - Long-term Debt (Details) [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 250.0        
Debt Instrument, Maturity Date May 04, 2016       Sep. 14, 2013
Debt Instrument, Basis Spread on Variable Rate   0.75%   0.50%  
Long-term Line of Credit     0    
Letters of Credit Outstanding, Amount     49.6    
Line of Credit Facility, Remaining Borrowing Capacity     200.4    
Proceeds from Issuance of Debt         $ 100.0