Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
May 02, 2015	May 03, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 282,205us-gaap_NetIncomeLoss	$ 243,913us-gaap_NetIncomeLoss
Other comprehensive (loss) income:
Change in unrealized loss on investments, net of tax	(82)	(33)
Comprehensive income	$ 282,123us-gaap_ComprehensiveIncomeNetOfTax	$ 243,880us-gaap_ComprehensiveIncomeNetOfTax

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Data Type:	xbrli:monetaryItemType
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