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Leases - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Aug. 03, 2019	Jan. 31, 2021	Jan. 31, 2020	Feb. 01, 2019	Jan. 31, 2019
Lessee, Operating Lease, Option to Extend	options to extend the lease term for periods up to 5 years
Operating Lease, Weighted Average Remaining Lease Term	6 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent	4.02%
Operating lease, right-of-use asset	$ 1,760,000
Operating lease liability	$ 1,769,000
Accounting Standards Update 2016-02 [Member]
Operating lease, right-of-use asset				$ 2,000,000
Operating lease liability				$ 2,000,000
Maximum [Member]
Operating Lease Remaining Lease Term	12 years
Minimum [Member]
Operating Lease Remaining Lease Term	1 year
Scenario, Forecast [Member]
Lease expense, related party		$ 66,000	$ 64,000

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- Definition

Amount of lease expense incurred on related party lease agreement.

+ References

No definition available.

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- Definition

Remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

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-Publisher FASB
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-SubTopic 20
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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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