Property, Plant and Equipment - Summary of Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jan. 25, 2015	Jan. 26, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 236,059	$ 222,731
Less accumulated depreciation and amortization	(120,588)	(112,610)
Property, plant and equipment, net	115,471	110,121
Property
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,022	9,022
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,657	18,633
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,429	10,109
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	135,956	132,549
Enterprise resource planning systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,890	0
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	33,780	34,263
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,325	$ 18,155