Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 244,546	$ 215,656	$ 817,086	$ 756,500
Other comprehensive (loss) income:
Change in unrealized loss on investments, net of tax	(35)	(10)	(58)	(117)
Comprehensive income	$ 244,511	$ 215,646	$ 817,028	$ 756,383