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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($) $ in Thousands	12 Months Ended
	May. 02, 2015	Apr. 26, 2014
Movement in Standard Product Warranty Accrual
Beginning accrued warranty costs	$ 27,250	$ 25,146
Warranties issued during the period	14,113	13,008
Settlements made during the period	(13,829)	(13,796)
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	(1,053)	2,892
Ending accrued warranty costs	$ 26,481	27,250
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
Repurchase of Leased Equipment Guarantee [Member]
Guarantor Obligations
Total Obligations	$ 1,100	$ 1,100
Performance guarantees | Letter of credit and bank guarantees agreements
Guarantees:
Performance guarantees outstanding	13,615
Performance guarantees | Surety bonds
Guarantees:
Performance guarantees outstanding	$ 42,720

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Product Warranty Accrual, Installation Warranty Coverage Term

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Amount of loss contingency liability.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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