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Debt Debt (Senior Notes) (Details) - USD ($)
1 Months Ended
Sep. 30, 2012
Oct. 31, 2015
Jan. 31, 2015
Sep. 21, 2012
Senior Notes        
Debt Instrument        
Debt Instrument, Unamortized Discount       $ 1,300,000
Proceeds from Issuance of Long-term Debt $ 345,800,000      
Debt Instrument, Interest Rate, Stated Percentage   3.75% 3.75% 3.75%
Debt Issuance Cost $ 2,900,000      
Debt Instrument, Face Amount   $ 350,000,000 $ 350,000,000 $ 350,000,000
Receivables Securitization Program        
Debt Instrument        
Line of Credit, Amount Outstanding   0 0  
Credit Agreement        
Debt Instrument        
Line of Credit, Amount Outstanding   $ 0 $ 0