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Selected Financial Statement Data Property and Equipment (Details) - USD ($) $ in Thousands | Oct. 27, 2018 | Apr. 28, 2018
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Land | $ 2,178 | $ 2,161
Buildings | 67,834 | 67,773
Machinery and equipment | 97,437 | 93,439
Office furniture and equipment | 6,073 | 5,878
Computer software and hardware | 54,982 | 53,004
Equipment held for rental | 287 | 287
Demonstration equipment | 7,004 | 7,035
Transportation equipment | 7,667 | 7,632
Property, Plant and Equipment, Gross | 243,462 | 237,209
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 173,992 | 169,150
Property and equipment, net | $ 69,470 | $ 68,059

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