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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Apr. 27, 2013 | Apr. 28, 2012
--- | --- | ---
Deferred taxes assets: |  |
Warranty reserves | $ 9,847 | $ 8,425
Vacation accrual | 1,788 | 1,821
Net losses on equity investments | 3,066 | 2,971
Deferred maintenance revenue | 2,439 | 1,738
Reserves for excess and obsolete inventory | 1,246 | 1,021
Equity compensation | 1,049 | 653
Allowance for doubtful accounts | 599 | 473
Inventory capitalization | 600 | 907
Accrued compensation and benefits | 1,077 | 742
Intangible assets | 37 | 81
Net operating loss carry forwards | 0 | 15
Other | 440 | 334
Deferred tax assets, gross | 22,188 | 19,181
Deferred tax liabilities: |  |
Property and equipment | (7,542) | (8,817)
Prepaid expenses | (662) | (669)
Other | (168) | (219)
Deferred tax liabilities, gross | (8,372) | (9,705)
Deferred tax assets, net | $ 13,816 | $ 9,476

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph d, e, f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant