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Customer Financing - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 28, 2012
Apr. 30, 2011
Apr. 24, 2010
Customer Financing [Line Items]      
Maximum credit financed for equipment purchases for any one customer $ 0.4    
Number of customer financing contracts 2    
Financing contracts sold under ASC 860 287.6 296.4 300.8
Current receivables of finance contracts not yet sold 81.8 78.5  
Unearned income 7.4 3.6  
Finance contracts receivable sold and outstanding 479.4    
Residual receivable 78.9 78.0  
Bad debt write-offs, percentage, maximum 1.00%    
The Bank Of Tokyo-Mitsubishi UFJ, Ltd.
     
Customer Financing [Line Items]      
Percentage of principal amount of financing contracts received 84.00%    
Percentage of principal amount of financing contracts held as collateral 16.00%    
Maximum holdback receivable 500    
U.S. Bank Group
     
Customer Financing [Line Items]      
Maximum holdback receivable 75    
Fifth Third National Bank
     
Customer Financing [Line Items]      
Holdback receivable outstanding $ 75