Restructuring and Related Costs - Narrative (Details) $ in Millions	Jan. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Cost recognized	$ 19.9
External Support Fees
Restructuring Cost and Reserve [Line Items]
Cost recognized	9.2
Employee Severance
Restructuring Cost and Reserve [Line Items]
Cost recognized	6.5
Asset Impairment Costs
Restructuring Cost and Reserve [Line Items]
Cost recognized	2.6
Lease Exit and Other
Restructuring Cost and Reserve [Line Items]
Cost recognized	$ 1.6