Commitments and Contingencies - Additional Information (Detail) $ in Thousands	12 Months Ended
Jan. 31, 2019 USD ($) $ / Employee_Contribution Store	Jan. 31, 2018 USD ($) $ / Employee_Contribution	Jan. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Number of lease commitment not opened \| Store	11
Commitments for un-fulfilled purchase orders	$ 511,410
Commitments with construction contractors	$ 49,118
U.S. based employees age limit to participate in 401(k) Saving Plan	18 years
Employer matching contribution per employee \| $ / Employee_Contribution	0.50	0.25
Percentage of employee contribution for first threshold limit of employer contribution	6.00%	6.00%
Employees contribution percentage vested	100.00%
Percentage of employers contribution per year vested	20.00%
Company's contribution to Savings Plan	$ 3,549	$ 2,602	$ 2,455
Nonqualified Deferred Compensation Plan
Commitments and Contingencies Disclosure [Line Items]
Employees contribution percentage vested	100.00%
Percentage of employers contribution per year vested	100.00%
Company's contribution to Savings Plan	$ 46	52	$ 84
Deferred compensation obligation	6,751	6,237
Aggregate market value of investments	$ 6,751	$ 6,237
Minimum
Commitments and Contingencies Disclosure [Line Items]
Operating lease, renewal option	5 years
Percentage of compensation deferred by employees under Saving Plan	1.00%
Maximum
Commitments and Contingencies Disclosure [Line Items]
Operating lease, renewal option	10 years
Percentage of compensation deferred by employees under Saving Plan	25.00%

Commitments and Contingencies Disclosure [Line Items]

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Commitments For Contracts With Construction Contractors

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Commitments From Vendors For Un Fulfilled Purchase Orders

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Deferred Compensation Per One Dollar Contributions Matched Over First Six Percent Contributions

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Employee Age Limit To Participate In Benefit Plan

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Number Of Lease Commitment Not Opened

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Percentage Of Compensation Deferred By Employee Under Benefit Plan

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Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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Amount of cost for defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

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Nominal or face amount on the investment owned.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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