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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 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 Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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