Legal Proceedings (Details)	12 Months Ended
	Jan. 30, 2016 USD ($) Well	Jan. 31, 2015 USD ($)	Feb. 01, 2014 USD ($)	Apr. 30, 2015 USD ($)	Dec. 10, 2010 USD ($)	Dec. 14, 2007 USD ($)
Commitments and Contingencies Disclosure [Abstract]
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
Number of water supply wells | Well	2
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
Loss contingency, estimate of possible loss				$ 2,200,000	$ 15,600,000
Loss contingency, estimated recovery from a third party				$ 500,000
Amount related to outstanding environmental contingencies	$ 14,500,000	$ 14,100,000	$ 11,900,000
Pretax accruals for environmental contingencies included in provision for discontinued operations	$ 800,000	$ 2,800,000	$ 500,000