Legal Proceedings (Details) (USD $)	0 Months Ended	3 Months Ended
	Dec. 14, 2007	May 02, 2015	May 03, 2014	Feb. 02, 2013	Apr. 30, 2015	Jan. 31, 2015	Dec. 10, 2010 Claimant	Mar. 07, 2013
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
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
Amount related to outstanding environmental contingencies		14,100,000	11,900,000			14,100,000
Pretax accruals for environmental contingencies included in provision for discontinued operations		100,000	200,000
Approximate claims asserted against the company's acquiring bank					2,200,000		15,600,000
Estimated recovery from third party					500,000
Number of claimants							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