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Information about Options to Purchase Shares (Detail) - $ / shares	12 Months Ended
	Feb. 01, 2020	Feb. 02, 2019	Feb. 03, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted, exercise price lower range	$ 145.08	$ 113.80	$ 80.91
Options granted, exercise price upper range	231.86	$ 172.40	$ 110.50
Options, Exercise price, average	$ 180.22
Options Outstanding, Number Outstanding	1,890,955	2,337,316
Options Exercisable, Number Exercisable	671,406
Exercise prices $0.79 - $4.55
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted, exercise price lower range	$ 0.79
Options granted, exercise price upper range	$ 4.55
Options Outstanding, Number Outstanding	399,129
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 4 months 24 days
Options Exercisable, Number Exercisable	247,329
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 4 months 24 days
Exercise price $26.96
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options, Exercise price, average	$ 26.96
Options Outstanding, Number Outstanding	1,491,826
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 8 months 12 days
Options Exercisable, Number Exercisable	424,077
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 years 3 months 18 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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