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Customer Financing (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Jul. 30, 2011
Jul. 31, 2010
Apr. 30, 2011
Apr. 24, 2010
Jul. 30, 2011
Maximum [Member]
Jul. 30, 2011
The Bank Of Tokyo Mitsubishi UFJ, Ltd. [Member]
Jul. 30, 2011
U.S. Bank Group [Member]
Apr. 30, 2011
U.S. Bank Group [Member]
Aug. 12, 2011
Fifth Third National Bank [Member]
Maximum credit financed for equipment purchases for any one customer $ 0.4                
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   110 75
Holdback receivable outstanding             38    
Financing contracts sold under ASC 860 72.7 71.5              
Current receivables of finance contracts not yet sold 59.9   78.5            
Unearned income 2.8   3.6            
Finance contracts receivable sold and outstanding 468.5                
Residual receivable $ 81.7     $ 78.0          
Bad debt write-off, percentage         1.00%