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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Statement of Comprehensive Income [Abstract]      
Net earnings $ 924,724us-gaap_NetIncomeLoss $ 837,304us-gaap_NetIncomeLoss $ 786,763us-gaap_NetIncomeLoss
Other comprehensive income:      
Change in unrealized loss on investments, net of tax (59)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (196)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (50)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive income $ 924,665us-gaap_ComprehensiveIncomeNetOfTax $ 837,108us-gaap_ComprehensiveIncomeNetOfTax $ 786,713us-gaap_ComprehensiveIncomeNetOfTax