Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 215,656	$ 192,720	$ 756,500	$ 676,194
Other comprehensive (loss) income:
Change in unrealized loss on investments, net of tax	(10)	(18)	(117)	(65)
Comprehensive income	$ 215,646	$ 192,702	$ 756,383	$ 676,129