Fair Value (Details 1) (USD $) In Thousands	6 Months Ended
	Jul. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Fair Value, Beginning balance	$ 100,534
Redemptions	(1,375)
Gains and losses, net:
Reported in Other Comprehensive Income	2,764
Fair Value, Ending Balance	101,923
Available-for- sale ARS - Student Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Fair Value, Beginning balance	85,732
Redemptions	(1,375)
Gains and losses, net:
Reported in Other Comprehensive Income	1,961
Fair Value, Ending Balance	86,318
Available-for- sale ARS - Muni Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Fair Value, Beginning balance	14,802
Redemptions	0
Gains and losses, net:
Reported in Other Comprehensive Income	803
Fair Value, Ending Balance	$ 15,605