Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	Apr. 26, 2013 case
Contingent Liabilities (Textual) [Abstract]
Number of unresolved asbestos and silica-related product liability cases	2,800
Contingent liability for outstanding letters of credit, bank guarantees, and surety bonds	$ 342.8
Contingent liability related to surety bond	14.5
Contingent liability related to outstanding letters of credit or other guarantees	$ 7.5