Summary of Significant Accounting Policies Schedule of Fair Value Information (Tables)

12 Months Ended

Jan. 28, 2012

Summary of Significant Accounting Policies [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	January 28, 2012
	Level 1		Level 2		Level 3
	(in thousands)
U.S. treasury securities funds	$	131,543	$	—	$	—
	January 29, 2011
	Level 1		Level 2		Level 3
	(in thousands)
U.S. treasury securities funds	$	168,929	$	—	$	—