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Inventories (Details) - USD ($) $ in Thousands | Jan. 27, 2018 | Apr. 29, 2017
--- | --- | ---
Inventories |  |
Raw materials | $ 85,226 | $ 83,371
Work in process | 11,669 | 11,320
Finished goods | 110,445 | 101,444
FIFO inventories | 207,340 | 196,135
Excess of FIFO over LIFO | (21,021) | (21,021)
Total Inventories | $ 186,319 | $ 175,114

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