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Credit Agreement and Long- Term Debt - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 24, 2021 | Apr. 30, 2022 | Apr. 30, 2021 | Jan. 31, 2021 | Oct. 31, 2020 | Aug. 01, 2020 | Jul. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  | $ 500,000 | $ 400,000 | $ 600,000
Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments for debt issuance costs |  |  |  | $ 200,000 |  |  |  | 200,000 |  |
Capilaized finance costs |  |  |  | 100,000 |  |  |  | 100,000 |  |
Debt related expenses |  |  |  | $ 100,000 |  |  |  | $ 100,000 |  |
Principal payment terms |  |  |  |  |  |  |  | the principal amount of the quarterly installment required to be paid on the last day of our fiscal quarter ending January 31, 2021 was $1.1 million; the principal amount of the quarterly installment required to be paid on the last day of the our fiscal quarter ending on or about April 30, 2021 will be $1.1 million; the principal amount of each quarterly installment required to be paid on the last day of each of the our fiscal quarters ending on or about July 31, 2021, October 31, 2021, January 31, 2022 and April 30, 2022 is $1.4 million, and the entire remaining principal balance of the term loan is required to be paid on June 15, 2022 |  |
Longterm Debt instrument, maturity date |  |  |  | Jun. 15, 2022 |  |  |  | Jun. 15, 2022 |  |
Debt Instrument, Frequency of Periodic Payment |  |  |  |  |  |  |  | quarterly installment |  |
Debt Instrument, principal Periodic payment |  |  |  |  | $ 800,000 | $ 1,400,000 |  |  |  |
Term Loan [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, principal Periodic payment |  | $ 1,400,000 | $ 1,100,000 |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Fees related to the revolving line of credit |  |  |  |  |  |  |  | $ 100,000 |  |
Unamortized debt issuance cost |  |  |  | $ 100,000 |  |  |  | $ 100,000 |  |
Variable interest rate |  |  |  |  |  |  |  | 1.00 |  |
LIBOR [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 1.00% |  |  |  |  |  |  | 1.00% |  |
Federal Funds Effective Swap Rate [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 0.50% |  |
Minimum [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, principal Periodic payment |  |  |  | 1,100,000 |  |  | $ 800,000 |  |  |
Minimum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage added to variable rate |  |  |  |  |  |  |  | 1.15% |  |
Commitment fee rate |  |  |  |  |  |  |  | 0.25% |  |
Minimum [Member] | LIBOR [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 2.15% |  |
Maximum [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, principal Periodic payment |  |  |  | 1,400,000 |  |  | $ 1,400,000 |  |  |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage added to variable rate |  |  |  |  |  |  |  | 2.65% |  |
Commitment fee rate |  |  |  |  |  |  |  | 0.675% |  |
Maximum [Member] | LIBOR [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 3.65% |  |
Bank of America, N.A. [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term loans repaid |  |  |  |  |  |  |  | $ 1,500,000 |  |
Bank of America, N.A. [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term loan, principal amount |  |  |  | 15,200,000 |  |  |  | 15,200,000 |  |
Bank of America, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 10,000,000.0 |  |  |  | $ 10,000,000.0 |  |
Revolving line of credit, Outstanding loan amount weighted average interest rate |  |  |  | 3.41% |  |  |  | 3.41% |  |
Credit facility, remaining borrowing capacity |  |  |  | $ 10,000,000.0 |  |  |  | $ 10,000,000.0 |  |
Bank of America, N.A. [Member] | Revolving Credit Facility [Member] | Other Expense [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving line of credit, Interest expenses incurred |  |  |  |  |  |  |  | $ 188,000 |  |

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