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Summary of Significant Accounting Policies - Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 03, 2015
Dec. 28, 2013
Accounting Policies [Abstract]    
Raw materials and parts $ 126,121us-gaap_InventoryRawMaterialsAndSupplies $ 110,310us-gaap_InventoryRawMaterialsAndSupplies
Work in process 17,828us-gaap_InventoryWorkInProcess 20,448us-gaap_InventoryWorkInProcess
Finished goods 111,827us-gaap_InventoryFinishedGoods 89,358us-gaap_InventoryFinishedGoods
Inventory, Gross $ 255,776us-gaap_InventoryGross $ 220,116us-gaap_InventoryGross