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Commitments and Contingencies - Guarantees and Warranties (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 25, 2014
Jan. 25, 2014
Minimum
Jan. 25, 2014
Maximum
Jan. 25, 2014
Repurchase of equipment guarantees
Apr. 27, 2013
Repurchase of equipment guarantees
Jan. 25, 2014
Performance guarantees
Letter of credit and bank guarantees agreements
Jan. 25, 2014
Performance guarantees
Surety bonds
Guarantees:              
Guarantees total obligations       $ 1,100 $ 1,285    
Performance guarantees outstanding           5,815 13,591
Warranties:              
Standard parts warranty period   1 year 5 years        
Installation warranty period   1 year 10 years        
Movement in Standard Product Warranty Accrual              
Beginning accrued warranty costs 25,146            
Warranties issued during the period 7,304            
Settlements made during the period (10,654)            
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations 3,876            
Ending accrued warranty costs $ 25,672