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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended |
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Jan. 31, 2021 | Jul. 31, 2020
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Services pursuant to contracts term (in months) | 12 months |
Support services term (in months) | 12 months |
Additional charges | $ 0 |
Salvage value assigned to property and equipment | $ 0 |
Customer relationships |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Intangible assets amortization period (in years) | 8 years |
Building |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Estimated useful lives (in years) | 30 months |
Property Improvements |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Estimated useful lives (in years) | 10 years |
Minimum |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Performance period of long-term projects (in months) | 3 months |
Estimated useful lives (in years) | 3 years |
Minimum | Proprietary rights developed technology and amortizable trade names |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Intangible assets amortization period (in years) | 10 years |
Minimum | Patents |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Intangible assets amortization period (in years) | 8 years |
Maximum |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Performance period of long-term projects (in months) | 12 months |
Lease term (in years) | 1 year | 1 year
Estimated useful lives (in years) | 7 years |
Maximum | Proprietary rights developed technology and amortizable trade names |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Intangible assets amortization period (in years) | 15 years |
Maximum | Patents |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Intangible assets amortization period (in years) | 10 years |
Seamap |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Customers warranty against defects (in months) | 3 months |
Klein |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |
Customers warranty against defects (in months) | 12 months |

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