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Commitments and Contingencies - Guarantees and Warranties (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 26, 2013	Oct. 26, 2013 Minimum	Oct. 26, 2013 Maximum	Oct. 26, 2013 Repurchase of equipment guarantees	Apr. 27, 2013 Repurchase of equipment guarantees	Oct. 26, 2013 Repurchase of equipment guarantees Accrued expenses	Apr. 27, 2013 Repurchase of equipment guarantees Accrued expenses	Oct. 26, 2013 Performance guarantees Letter of credit and bank guarantees agreements	Oct. 26, 2013 Performance guarantees Surety bonds
Guarantees:
Guarantees total obligations				$ 1,285	$ 1,285
Guarantee liability						185	185
Performance guarantees outstanding								5,293	11,462
Warranties:
Standard parts warranty period		1 year	5 years
Installation warranty period		1 year	10 years
Movement in Standard Product Warranty Accrual
Beginning accrued warranty costs	25,146
Warranties issued during the period	5,644
Settlements made during the period	(8,137)
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	4,094
Ending accrued warranty costs	$ 26,747

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- Definition

Product Warranty Accrual, Installation Warranty Coverage Term

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- Definition

Product Warranty Accrual, Standard Parts Warranty Coverage Term

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

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- Definition

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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- Definition

Amount of loss contingency liability.

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-SubTopic 20

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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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Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

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Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).

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Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

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