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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Oct. 29, 2016
Apr. 30, 2016
May 02, 2015
Oct. 29, 2016
Warranties:        
Identified warranty obligations accrued $ 3,190      
Remaining accrual 30,496 $ 30,496   $ 29,850
Movement in Standard Product Warranty Accrual        
Beginning accrued warranty costs 30,496      
Warranties issued during the period 5,444      
Settlements made during the period (9,280)      
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations 3,190      
Ending accrued warranty costs $ 29,850 30,496    
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       12,120
Performance guarantees | Surety bonds        
Guarantees:        
Performance guarantees outstanding       31,410
Out-of-Home Product Application        
Warranties:        
Identified warranty obligations accrued $ 754 9,174 $ 1,168  
Remaining accrual 3,998     $ 3,998
Movement in Standard Product Warranty Accrual        
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations 754 $ 9,174 $ 1,168  
Ending accrued warranty costs $ 3,998