Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,117,654	$ 1,020,661	$ 924,724
Other comprehensive income (loss):
Change in unrealized loss on investments, net of tax	(91)	(148)	(59)
Comprehensive income	$ 1,117,563	$ 1,020,513	$ 924,665