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v3.19.1

Balance Sheet - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 USD ($) customer | Jan. 31, 2019 USD ($) customer
Balance Sheet [Line Items] |  |
Contracts receivable | $ 2,600,000 | $ 3,000,000
Number of customers due | customer | 2 | 3
Contracts receivable, noncurrent | $ 465,000 |
Contracts receivable, interest rate | 3.10% | 3.60%
Impairment of long-lived assets | $ 0 |
Minimum |  |
Balance Sheet [Line Items] |  |
Contracts receivable repayment term | 4 months |
Maximum |  |
Balance Sheet [Line Items] |  |
Contracts receivable repayment term | 33 months |

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