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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Property, Plant and Equipment |  |  |
Gross property, plant and equipment | $ 520,772 | $ 490,857 |
Accumulated depreciation | (339,890) | (321,725) |
Net property, plant and equipment | 180,882 | 169,132 |
Depreciation expense | 27,500 | 25,400 | $ 23,300
Buildings and building fixtures |  |  |
Property, Plant and Equipment |  |  |
Gross property, plant and equipment | $ 200,370 | 196,817 |
Buildings and building fixtures | Minimum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 3 years |  |
Buildings and building fixtures | Maximum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 40 years |  |
Machinery and equipment |  |  |
Property, Plant and Equipment |  |  |
Gross property, plant and equipment | $ 147,542 | 141,071 |
Machinery and equipment | Minimum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 3 years |  |
Machinery and equipment | Maximum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 15 years |  |
Information systems and software |  |  |
Property, Plant and Equipment |  |  |
Gross property, plant and equipment | $ 84,881 | 76,684 |
Information systems and software | Minimum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 3 years |  |
Information systems and software | Maximum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 10 years |  |
Land |  |  |
Property, Plant and Equipment |  |  |
Gross property, plant and equipment | $ 14,626 | 14,565 |
Land improvements |  |  |
Property, Plant and Equipment |  |  |
Gross property, plant and equipment | $ 15,362 | 15,178 |
Land improvements | Minimum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 3 years |  |
Land improvements | Maximum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 30 years |  |
Transportation equipment |  |  |
Property, Plant and Equipment |  |  |
Gross property, plant and equipment | $ 13,929 | 14,905 |
Transportation equipment | Minimum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 3 years |  |
Transportation equipment | Maximum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 10 years |  |
Furniture and fixtures |  |  |
Property, Plant and Equipment |  |  |
Gross property, plant and equipment | $ 20,812 | 20,390 |
Furniture and fixtures | Minimum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 3 years |  |
Furniture and fixtures | Maximum |  |  |
Property, Plant and Equipment |  |  |
Estimated Useful Lives | 15 years |  |
Construction in progress |  |  |
Property, Plant and Equipment |  |  |
Gross property, plant and equipment | $ 23,250 | $ 11,247 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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