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Customer Financing - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 26, 2013
Oct. 27, 2012
Oct. 26, 2013
Oct. 27, 2012
Apr. 27, 2013
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 46,058 48,016 115,554 143,077  
Current receivables of finance contracts not yet sold 49,326   49,326   64,272
Unearned income 1,115   1,115   1,586
Finance contracts receivable sold and outstanding 464,442   464,442    
Deferred purchase price 72,724   72,724   72,328
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 500,000   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 $ 100,000   $ 100,000