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Inventories (Details) - USD ($) $ in Thousands | Apr. 29, 2017 | Apr. 30, 2016
--- | --- | ---
Inventories |  |
Raw materials | $ 83,371 | $ 87,905
Work in process | 11,320 | 11,591
Finished goods | 101,444 | 97,861
FIFO inventories | 196,135 | 197,357
Excess of FIFO over LIFO | (21,021) | (21,768)
Total inventories | $ 175,114 | $ 175,589

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