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Derivative Financial Instruments (Narrative) (Details) - USD ($)
Aug. 12, 2012
Nov. 30, 2014
Oct. 31, 2014
3.40% Senior Notes due 2022 | Senior Notes      
Derivative [Line Items]      
Aggregate principal of Senior Notes $ 300,000,000 $ 300,000,000  
Senior Notes term 10 years    
Interest rate on Senior Notes 3.40%    
Interest rate cash flow hedges (1)      
Derivative [Line Items]      
Amount of debt hedged $ 200,000,000    
Loss from forward starting interest rate swaps $ 42,700,000    
Cash Flow Hedging | Treasury Lock      
Derivative [Line Items]      
Derivative amount     $ 50,000,000
Derivative interest rate (percent)     2.36%