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Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Jan. 31, 2016 USD ($) Store	Jan. 31, 2015 USD ($)	Jan. 31, 2014 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Number of lease commitment not opened | Store	37
Commitments for un-fulfilled purchase orders	$ 407,833,000
Commitments with construction contractors	$ 1,535,000
U.S. based employees age limit to participate in 401(k) Saving Plan	18 years
Employer matching contribution per employee	$ 0.25
Percentage of employee contribution for first threshold limit of employer contribution	6.00%
Employees contribution percentage vested	100.00%
Percentage of employers contribution per year vested	20.00%
Company's contribution to Savings Plan	$ 2,121,000	$ 1,708,000	$ 1,770,000
Nonqualified Deferred Compensation Plan
Commitments and Contingencies Disclosure [Line Items]
Employer matching contribution per employee	$ 0.25
Percentage of employee contribution for first threshold limit of employer contribution	6.00%
Employees contribution percentage vested	100.00%
Percentage of employers contribution per year vested	100.00%
Company's contribution to Savings Plan	$ 105,000	100,000	$ 0
Deferred compensation obligation	4,363,000	3,778,000
Aggregate market value of investments	$ 4,363,000	$ 3,778,000
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%

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Commitments and Contingencies Disclosure [Line Items]

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

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The amount of the cost recognized during the period for defined contribution plans.

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Nominal or face amount on the investment owned.

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Term of the lessor's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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