Retirement Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Maximum Employee Contribution Percent	6.00%
Percentage of Employee's Contribution Matched by Company	50.00%
Company's matching contributions	$ 531,000	$ 521,000	$ 457,000
Company's additional contributions on behalf of employees	0	0	0
Company's matching contributions	$ 48,000	$ 63,000	$ 52,000

Defined contribution plan employer discretionary contribution additional amount.

No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

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No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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No definition available.

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