Fair Value (Level 3 Assets and Liabilities Rollforward) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 27, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Fair value, beginning balance	$ 99,508
Redemptions / Settlements	(80,693)
Gains, net:
Reported in Net Income	1,088
Fair value, ending balance	19,903
Available-for-sale ARS - Student Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Fair value, beginning balance	84,650
Redemptions / Settlements	(80,693)
Gains, net:
Reported in Net Income	798
Fair value, ending balance	4,755
Available for sale ARS - Muni Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Fair value, beginning balance	14,858
Redemptions / Settlements	0
Gains, net:
Reported in Net Income	290
Fair value, ending balance	$ 15,148