Commitments and Contingencies - Guarantees and Warranties (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Oct. 27, 2012	Apr. 28, 2012
Guarantor Obligations
Product Warranty Accrual	$ 22,844	$ 22,215
Movement in Standard Product Warranty Accrual
Warranties issued during the period	5,349
Settlements made during the period	(7,320)
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations	2,600
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 equipment guarantees
Guarantees:
Guarantees total obligations	1,285	1,285
Performance guarantees \| Letter of credit agreements
Guarantees:
Performance guarantees outstanding	3,989
Performance guarantees \| Bank guarantees and surety bonds
Guarantees:
Performance guarantees outstanding	27,897
Accrued expenses \| Repurchase of equipment guarantees
Guarantees:
Guarantee liability	$ 185

Product Warranty Accrual, Installation Warranty Coverage Term

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- Definition

Product Warranty Accrual, Standard Parts Warranty Coverage Term

+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

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-Name FASB Interpretation (FIN)

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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

The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

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-Name Accounting Standards Codification

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- Definition

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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-Publisher SEC

-Name Regulation S-X (SX)

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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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- Definition

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).

+ References

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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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