Legal Proceedings (Details)		3 Months Ended			9 Months Ended
	Dec. 14, 2007 USD ($)	Oct. 31, 2015 USD ($)	Nov. 01, 2014 USD ($)	Feb. 02, 2013 USD ($)	Oct. 31, 2015 USD ($)	Nov. 01, 2014 USD ($)	Apr. 30, 2015 USD ($)	Jan. 31, 2015 USD ($)	Feb. 01, 2014 USD ($)	Mar. 07, 2013 USD ($)	Dec. 10, 2010 USD ($) Claimant
Loss Contingencies [Line Items]
Minimum estimated undiscounted costs of preparing RIFS for remedial alternatives					$ 0
Maximum estimated undiscounted costs of preparing RIFS for remedial alternatives					24,000,000.0
Present worth for remedy of a combination of groundwater extraction and treatment and in-site chemical oxidation		$ 10,700,000			10,700,000
Minimum historical cost associated with enhanced treatment required by the impact of groundwater plume					1,800,000
Maximum historical cost associated with enhanced treatment required by the impact of groundwater plume					2,500,000
Future operation and maintenance costs					126,400
Minimum amount of complaint under number of state law theories	$ 41,000,000
Period of complaint under number of state law theories	70 years
Approximate claims asserted against the company's acquiring bank							$ 2,200,000				$ 15,600,000
Estimated recovery from third party							$ 500,000
Amount related to outstanding environmental contingencies		14,500,000	$ 11,900,000		14,500,000	$ 11,900,000		$ 14,100,000	$ 14,100,000
Pretax accruals for environmental contingencies included in provision for discontinued operations		$ 600,000	$ 100,000		$ 800,000	$ 500,000
Number of claimants | Claimant											2
Positive Outcome of Litigation
Loss Contingencies [Line Items]
Gain contingency, unrecorded amount										$ 13,300,000
Computer Network Intrusion | Threatened Litigation
Loss Contingencies [Line Items]
Charges recorded to earning				$ 15,400,000