Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	1 Months Ended							3 Months Ended		9 Months Ended
	Oct. 31, 2013	May 31, 2013	Jan. 31, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Jan. 31, 2012	Nov. 02, 2013	Oct. 27, 2012	Nov. 02, 2013	Oct. 27, 2012	Feb. 02, 2013	Jan. 28, 2012
Accounting Policies [Abstract]
Fair value of cash and cash equivalents considered as Level 1 inputs								$ 372,270,000	$ 623,822,000	$ 372,270,000	$ 623,822,000	$ 646,761,000	$ 649,835,000
Cash dividend date declared				2012-11	2012-08	2012-05	2012-01
Cash dividends declared per share (in dollars per share)		$ 0.17	$ 0.17	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.17	$ 0.14	$ 0.34	$ 0.28
Sales and purchase agreement, property purchase price agreed upon	$ 222,000,000
Sales and purchase agreement, property lease term	99 years
Sales and purchase agreement, down payment paid for property, pecentage	10.00%