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Commitments and Contingencies - Guarantees and Warranties (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Apr. 26, 2014 | Apr. 27, 2013
Movement in Standard Product Warranty Accrual |  |
Beginning accrued warranty costs | $ 25,146 | $ 22,215
Warranties issued during the period | 13,008 | 11,140
Settlements made during the period | (13,796) | (13,875)
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations | 2,892 | 5,666
Ending accrued warranty costs | 27,250 | 25,146
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 |  |
Guarantor Obligations |  |
Total Obligations | 1,100 | 1,100
Repurchase of equipment guarantees | Accrued expenses |  |
Movement in Standard Product Warranty Accrual |  |
Guarantor Obligations, Current Carrying Value | 0 | 0
Performance guarantees | Letter of credit and bank guarantees agreements |  |
Guarantees: |  |
Performance guarantees outstanding | 11,350 |
Performance guarantees | Surety bonds |  |
Guarantees: |  |
Performance guarantees outstanding | $ 16,048 |

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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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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(5)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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