Commitments And Contingencies (Details) (USD $)	12 Months Ended
	Jan. 31, 2015
Loss Contingencies [Line Items]
Expected on-site remediation liability, year one	$ 200,000
Expected on-site remediation liability, year two	200,000
Expected on-site remediation liability, year three	200,000
Expected on-site remediation liability, year four	200,000
Expected on-site remediation liability, year five	200,000
Estimated Litigation Liability	1,500,000
Loss Contingency, Range of Possible Loss, Minimum	1,000,000
Loss Contingency Accrual	1,500,000
Redfield Site [Member]
Loss Contingencies [Line Items]
Liability for on-site remediation, discounted rate	4.80%
On-site remediation liability, undiscounted basis	15,400,000
Expected on-site remediation liability, thereafter	14,400,000
Cumulative expenditures for both on-site and off-site remediation	26,900,000
Reserve for anticipated future remediation activities	9,800,000
Reserve for anticipated future remediation activities for on-site remediation	5,200,000
Reserve for anticipated future remediation activities for off-site remediation	4,600,000
Redfield Site Other Liabilities [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies in other liabilities	9,100,000
Redfield Site Other Accrued Expense [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies in other accrued expenses	700,000
New York Tannery And Two Associated Landfills [Member]
Loss Contingencies [Line Items]
Liability for on-site remediation, discounted rate	6.40%
Expected on-site remediation liability, thereafter	800,000
Accrual for environmental loss contingencies in other accrued expenses	200,000
Accrued liability to complete the cleanup, maintenance and monitoring at all sites	1,300,000
Accrued liability on an undiscounted basis	$ 1,800,000