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Customer Financing - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 26, 2013
Jan. 28, 2012
Jan. 26, 2013
Jan. 28, 2012
Apr. 28, 2012
Customer Financing [Line Items]          
Maximum credit financed for equipment purchases for any one customer $ 400   $ 400    
Number of customer financing contracts     2    
Financing contracts sold under ASC 860 62,700 77,195 205,777 213,025  
Current receivables of finance contracts not yet sold 73,908   73,908   81,822
Unearned income 3,737   3,737   7,396
Finance contracts receivable sold and outstanding 485,345   485,345    
Deferred purchase price 98,348   98,348   78,923
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     78.00%    
Percentage of principal amount of financing contracts held as collateral     22.00%    
Maximum holdback receivable 500,000   500,000    
Fifth Third Bank
         
Customer Financing [Line Items]          
Percentage of principal amount of financing contracts received     82.00%    
Percentage of principal amount of financing contracts held as collateral     18.00%    
Maximum holdback receivable $ 75,000   $ 75,000