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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Services pursuant to contracts term | 12 months |  |
Support services term | 12 months |  |
Additional charges | $ 0 |  |
Salvage value assigned to property and equipment | $ 0 |  |
Customers warranty against defects | 3 months |  |
Customer relationships |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible assets amortization period | 8 years |  |
Building |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 30 years |  |
Property Improvements |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Maximum |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Lease period | 1 year | 1 year | 1 year
Contracts receivable term | 2 years |  |
Liquid investments maturity period | 3 months |  |
Short-term investments maturity period | 12 months |  |
Estimated useful lives | 7 years |  |
Maximum | Proprietary Rights Developed Technology and Amortizable Trade Names |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible assets amortization period | 15 years |  |
Maximum | Patents |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible assets amortization period | 9 years |  |
Maximum | Recording channels |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 7 years |  |
Maximum | Other peripheral equipment |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Minimum |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Short-term investments maturity period | 3 months |  |
Estimated useful lives | 3 years |  |
Minimum | Proprietary Rights Developed Technology and Amortizable Trade Names |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible assets amortization period | 10 years |  |
Minimum | Patents |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible assets amortization period | 8 years |  |
Minimum | Recording channels |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Minimum | Other peripheral equipment |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 2 years |  |

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