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Commitments and Contingencies - Guarantees and Warranties (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Movement in Standard Product Warranty Accrual    
Beginning accrued warranty costs $ 25,146 $ 22,215
Warranties issued during the period 13,008 11,140
Settlements made during the period (13,796) (13,875)
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations 2,892 5,666
Ending accrued warranty costs 27,250 25,146
Minimum
    
Warranties:    
Standard parts warranty period 1 year  
Installation warranty period 1 year  
Maximum
    
Warranties:    
Standard parts warranty period 5 years  
Installation warranty period 10 years  
Repurchase of equipment guarantees
    
Guarantor Obligations    
Total Obligations 1,100 1,100
Repurchase of equipment guarantees | Accrued expenses
    
Movement in Standard Product Warranty Accrual    
Guarantor Obligations, Current Carrying Value 0 0
Performance guarantees | Letter of credit and bank guarantees agreements
    
Guarantees:    
Performance guarantees outstanding 11,350  
Performance guarantees | Surety bonds
    
Guarantees:    
Performance guarantees outstanding $ 16,048