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Property, Plant and Equipment (Details Textual) (USD $)
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Property Plant And Equipment [Line Items]      
Depreciation and amortization $ 12,469,000us-gaap_DepreciationAndAmortization $ 12,233,000us-gaap_DepreciationAndAmortization $ 10,608,000us-gaap_DepreciationAndAmortization
Amortization expense 300,000us-gaap_AmortizationOfIntangibleAssets 400,000us-gaap_AmortizationOfIntangibleAssets 500,000us-gaap_AmortizationOfIntangibleAssets
Property, Plant and Equipment      
Property Plant And Equipment [Line Items]      
Depreciation and amortization 11,900,000us-gaap_DepreciationAndAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		 11,800,000us-gaap_DepreciationAndAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		 10,000,000us-gaap_DepreciationAndAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
Computer software      
Property Plant And Equipment [Line Items]      
Amortization expense $ 3,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 $ 3,800,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 $ 3,200,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember