Receivables (Schedule Of Receivables Based On Year Of Origination) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	$ 473,041
2013 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	435,117
2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	6,936
2011 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	5,992
2010 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	3,493
2009 And Prior [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	5,073
Revolving Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	$ 16,430