Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May 02, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 290,634	$ 282,205
Other comprehensive (loss) income:
Change in unrealized loss on investments, net of tax	(12)	(82)
Comprehensive income	$ 290,622	$ 282,123