Significant Accounting Policies - Estimated Useful Lives of Property, Plant, and Equipment (Details)	12 Months Ended
	Jan. 31, 2016
Building and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Building and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	39 years
Enterprise resource planning systems
Property, Plant and Equipment [Line Items]
Estimated useful life	13 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	8 years
Transportation vehicles
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Computers and computer software
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years