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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Highly liquid investments with an original maturity |  | 90 days or less |  |
Cash of held in foreign bank accounts |  | $ 3,900,000 | $ 3,900,000 |
Net transactional foreign exchange losses |  | 700,000 | 200,000 | $ 200,000
Advertising expense |  | 1,900,000 | 1,800,000 | 1,600,000
Impairment charges for long-lived assets |  | 0 | 0 | 0
Impairment charges for intangible assets |  | $ 0 | $ 0 | $ 0
Number of common equivalent shares |  | 326,275 | 675,600 | 459,700
No compensation expense is recognized on forfeited options |  | $ 0 |  |
Reclassification from accumulated other comprehensive income to retained earnings | $ 14,000 |  |  |
Right-of-use assets and lease liabilities relating to operating leases |  | $ 2,000,000 |  |
Maximum [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of revenue satisfied for services |  | 9.00% |  |
Maximum [Member] | Airborne Product [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Products warranty period |  | 5 years |  |
Minimum [Member] | Airborne Product [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Products warranty period |  | 4 years |  |
Land Improvements [Member] | Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of the assets |  | 20 years |  |
Land Improvements [Member] | Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of the assets |  | 10 years |  |
Building And Leasehold Improvements [Member] | Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of the assets |  | 45 years |  |
Building And Leasehold Improvements [Member] | Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of the assets |  | 10 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of the assets |  | 10 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of the assets |  | 3 years |  |
Computer Equipment And Software [Member] | Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of the assets |  | 10 years |  |
Computer Equipment And Software [Member] | Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of the assets |  | 3 years |  |

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