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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 29, 2017	Apr. 29, 2017	Apr. 30, 2016	May 02, 2015	Jul. 29, 2017
Warranties:
Identified warranty obligations accrued	$ 1,219
Remaining accrual	27,899	$ 27,899			$ 29,753
Movement in Standard Product Warranty Accrual
Beginning accrued warranty costs	27,899
Warranties issued during the period	4,128
Settlements made during the period	(3,493)
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	1,219
Ending accrued warranty costs	$ 29,753	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					8,914
Performance guarantees | Surety bonds
Guarantees:
Performance guarantees outstanding					21,590
Out-of-Home Product Application
Warranties:
Identified warranty obligations accrued	$ 783	1,766	$ 9,174	$ 1,168
Remaining accrual	2,776				$ 2,776
Movement in Standard Product Warranty Accrual
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	783	$ 1,766	$ 9,174	$ 1,168
Ending accrued warranty costs	$ 2,776

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Amount of loss contingency liability.

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