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General - Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 24, 2016
Apr. 26, 2015
Apr. 24, 2016
Apr. 26, 2015
Revocable standby letters of credit        
Guarantees        
Guarantee term     P1Y  
Standby letters of credit $ 4.0   $ 4.0  
Rabbi trust        
Investments        
Gains (losses) related to securities held $ 2.9 $ 1.5 $ 1.2 $ 3.0