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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2016
May 02, 2015
Movement in Standard Product Warranty Accrual    
Beginning accrued warranty costs $ 26,481 $ 27,250
Warranties issued during the period 10,528 14,113
Settlements made during the period (18,377) (13,829)
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations 11,864 (1,053)
Ending accrued warranty costs $ 30,496 26,481
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  
Performance guarantees | Letter of credit and bank guarantees agreements    
Guarantees:    
Performance guarantees outstanding $ 7,354  
Performance guarantees | Surety bonds    
Guarantees:    
Performance guarantees outstanding 50,593  
Out-of-Home Product Application [Member]    
Movement in Standard Product Warranty Accrual    
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations 9,200 $ 1,200
Ending accrued warranty costs $ 5,500