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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 30, 2016	Apr. 30, 2016	May 02, 2015	Jul. 30, 2016
Warranties:
Identified warranty obligations accrued	$ 967
Remaining accrual	30,496	$ 30,496		$ 29,916
Movement in Standard Product Warranty Accrual
Beginning accrued warranty costs	30,496
Warranties issued during the period	3,066
Settlements made during the period	(4,613)
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	967
Ending accrued warranty costs	$ 29,916	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				9,479
Performance guarantees | Surety bonds
Guarantees:
Performance guarantees outstanding				38,808
Out-of-Home Product Application
Warranties:
Identified warranty obligations accrued	$ 247	9,174	$ 1,168
Remaining accrual	4,567			$ 4,567
Movement in Standard Product Warranty Accrual
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	247	$ 9,174	$ 1,168
Ending accrued warranty costs	$ 4,567

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Amount of loss contingency liability.

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