Restructuring and Other Charges (Details) $ in Millions	3 Months Ended
	Apr. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Expected annual reduction in operating costs and expenses	$ 12.0
Other restructuring charges	3.1
Other restructuring charges, after tax	2.1
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	3.4
Restructuring charges incurred, after tax	2.1
Severance and Benefit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	1.7
Severance and Benefit Costs [Member] | Selling, general and administrative expenses [Member]
Restructuring Cost and Reserve [Line Items]
Other restructuring charges	1.3
Lease Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	0.7
Lease Termination Costs [Member] | Selling, general and administrative expenses [Member]
Restructuring Cost and Reserve [Line Items]
Other restructuring charges	1.2
Inventory-related charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	0.6
Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	0.4
Change in income tax reserves [Member] | Interest expense [Member]
Restructuring Cost and Reserve [Line Items]
Other restructuring charges	$ 0.6