Equity Award Plans - Additional Information (Details) - shares	9 Months Ended	12 Months Ended
Nov. 03, 2018	Feb. 03, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options granted with exercise price less than fair market value on grant date	0	0
Non-employee director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, vesting period	1 year
Restricted stock, shares vested	4,000
2005 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options to be issued	3,550,000
Common stock shares issued, restricted stock units or deferred stock units	2,250,000
Common stock available for grant	896,848
Target cumulative performance-based restricted stock units available for future declaration	75,471
Maximum cumulative restricted stock units available for future declaration	150,942
2005 Plan \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, vesting period	4 years
Share-based payment award, expiration period	10 years
2005 Plan \| Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, vesting period	1 year
Awards that may be issued	177,500
2005 Plan \| Performance-Based Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period	3 years
2005 Plan \| Maximum \| Restricted Stock and Time-Based RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, expiration period	4 years
2005 Plan \| Minimum \| Restricted Stock and Time-Based RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, expiration period	1 year
Non-executive chairman
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, vesting period	1 year
Restricted stock, shares vested	6,000

Maximum cumulative restricted stock units available for future declaration.

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- Definition

Number of options granted with exercise price less than fair market value on grant date.

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- Definition

Share based compensation arrangement by share based payment award maximum number of shares expected to be issued.

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- Definition

Number of shares of restricted stock granted to each director annually.

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- Definition

Maximum number of shares that may be issued as restricted stock or restricted stock units under the stock award plan.

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Target cumulative performance based restricted stock units available for future declaration.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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