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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 01, 2015
Apr. 27, 2014
Jan. 26, 2014
Inventory Disclosure [Abstract]      
Raw materials $ 5,787us-gaap_InventoryRawMaterialsNetOfReserves $ 6,707us-gaap_InventoryRawMaterialsNetOfReserves $ 6,177us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 2,227us-gaap_InventoryWorkInProcessNetOfReserves 2,263us-gaap_InventoryWorkInProcessNetOfReserves 2,177us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 29,999us-gaap_InventoryFinishedGoodsNetOfReserves 31,704us-gaap_InventoryFinishedGoodsNetOfReserves 35,333us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 38,013us-gaap_InventoryNet $ 40,674us-gaap_InventoryNet [1] $ 43,687us-gaap_InventoryNet
[1] Derived from audited financial statements.