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Nature of Business and Summary of Significant Accounting Policies - Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Apr. 26, 2014 | Apr. 27, 2013 | Apr. 28, 2012
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ 14,137 | $ 15,379 | $ 17,273
Buildings | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 7 years |  |
Buildings | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 40 years |  |
Machinery and equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Machinery and equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 7 years |  |
Office furniture and equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
Office furniture and equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Computer software and hardware | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
Computer software and hardware | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Equipment held for rental | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 2 years |  |
Equipment held for rental | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 7 years |  |
Demonstration equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
Demonstration equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Transportation equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Transportation equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 7 years |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Period Type: | duration

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- Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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