Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended						3 Months Ended		6 Months Ended				1 Months Ended		1 Months Ended
	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Jan. 31, 2013	Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014 Property, Plant and Equipment [Member]	Aug. 03, 2013 Property, Plant and Equipment [Member]	Oct. 31, 2013 New York City Office [Member]	Aug. 02, 2014 New York City Office [Member]	Aug. 31, 2014 Subsequent Event [Member]
Property, Plant and Equipment [Line Items]
Property and equipment purchased but not yet paid											$ 22.6	$ 15.0
Sales and purchase agreement, property purchase price agreed upon													222
Sales and purchase agreement, property lease, term													99 years
Sales And Purchase Agreement, Down Payment Paid For Property, Percentage													10.00%
Escrow deposit														$ 22.2
Cash dividend date declared	2014-05	2014-02	2013-11	2013-08	2013-05	2013-01
Cash dividends declared per share (in dollars per share)	$ 0.20	$ 0.2	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.2	$ 0.17	$ 0.4	$ 0.17					$ 0.20