Restructuring and Related Costs - Narrative (Details) $ in Millions	Apr. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Cost recognized	$ 28.7
External Support Fees
Restructuring Cost and Reserve [Line Items]
Cost recognized	13.7
Employee Severance
Restructuring Cost and Reserve [Line Items]
Cost recognized	10.3
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	$ 2.2