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Inventories (Details) - USD ($) $ in Thousands | Apr. 30, 2016 | Apr. 25, 2015
--- | --- | ---
Inventories |  |
Raw materials | $ 87,905 | $ 75,024
Work in process | 11,591 | 14,310
Finished goods | 97,861 | 92,295
FIFO inventories | 197,357 | 181,629
Excess of FIFO over LIFO | (21,768) | (24,840)
Total inventories | $ 175,589 | $ 156,789

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