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Inventories - Components of Inventory (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 37,289us-gaap_InventoryRawMaterialsNetOfReserves $ 33,056us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 6,839us-gaap_InventoryWorkInProcessNetOfReserves 6,020us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 25,444us-gaap_InventoryFinishedGoodsNetOfReserves 30,642us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 69,572us-gaap_InventoryNet $ 69,718us-gaap_InventoryNet