Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jan. 31, 2015
Oct. 28, 2014
Oct. 27, 2014
Line of Credit Facility [Line Items]      
Credit facilities, amount borrowed 295.0    
Multi-Currency Revolving Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility expiration period 5 years    
Credit facilities, maximum borrowing capacity   $ 400.0 $ 250.0