Commitments and Contingencies - Additional Information (Detail) $ in Thousands	12 Months Ended
Jan. 31, 2020 USD ($) $ / Employee_Contribution	Jan. 31, 2019 USD ($) $ / Employee_Contribution	Jan. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Commitments for un-fulfilled purchase orders	$ 543,703
Commitments with construction and distribution equipment contractors	$ 52,493
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	$ 7,094	$ 3,549	$ 2,602
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	$ 56	46	$ 52
Deferred compensation obligation	8,428	6,751
Aggregate market value of investments	$ 8,428	$ 6,751
Minimum
Commitments and Contingencies Disclosure [Line Items]
Percentage of compensation deferred by employees under Saving Plan	1.00%
Maximum
Commitments and Contingencies Disclosure [Line Items]
Percentage of compensation deferred by employees under Saving Plan	25.00%

Commitments and Contingencies Disclosure [Line Items]

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Commitments for contracts related to construction and distribution equipment.

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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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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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