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Revenue Recognition - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2021 | Jan. 31, 2021
Contract liabilities and extended warranties | $ 324,000 | $ 324,000 | $ 285,000
Revenue recognized | 202,000 | 202,000 |
Contract assets balance | 1,200,000 | 1,200,000 | $ 800,000
Additional contract costs | 400,000 | 400,000 |
Amortization of incremental direct costs |  | 26,000 |
Deferred incremental direct contract costs reported in other current assets | 100,000 | 100,000 |
Deferred incremental direct costs net of accumulated amortization | $ 1,300,000 | $ 1,300,000 |
Capitalized contract costs additional amounts incurred amortization period | 20 years | 6 years |
Change in Accounting Method Accounted for as Change in Estimate [Member] |  |  |
Capitalized contract costs additional amounts incurred amortization period |  | 20 years |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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