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Schedule of Estimated Fair Value of Options as of Grant Date by Using Black-Scholes Option Pricing Model (Detail) - $ / shares	12 Months Ended
	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	2.88%	1.75%	1.20%
Dividend yield	1.40%	1.50%	1.20%
Expected volatility factor	23.50%	23.50%	23.80%
Expected option life in years	4 years 10 months 24 days	4 years 9 months 18 days	4 years 9 months 18 days
Weighted average fair value of options issued	$ 11.85	$ 7.16	$ 7.28

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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