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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jan. 27, 2018	Apr. 29, 2017	Apr. 30, 2016	May 02, 2015	Jan. 27, 2018
Warranties:
Identified warranty obligations accrued	$ 5,230
Remaining accrual	27,899	$ 27,899			$ 29,200
Movement in Standard Product Warranty Accrual
Beginning accrued warranty costs	27,899
Warranties issued during the period	9,652
Settlements made during the period	(13,581)
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	5,230
Ending accrued warranty costs	$ 29,200	27,899
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					13,396
Performance guarantees | Surety bonds
Guarantees:
Performance guarantees outstanding					8,330
Out-of-Home Product Application
Warranties:
Identified warranty obligations accrued	$ 4,034	1,766	$ 9,174	$ 1,168
Remaining accrual	3,066				$ 3,066
Movement in Standard Product Warranty Accrual
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	4,034	$ 1,766	$ 9,174	$ 1,168
Ending accrued warranty costs	$ 3,066

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Amount of loss contingency liability.

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