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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Lease period | One year or less |  |
Services pursuant to contracts term | 12 months |  |
Support services term | 12 months |  |
Additional charges | $ 0 mind_SupportServicesAdditionalCharges |  |
Contracts receivable term | Less than two years |  |
Liquid investments maturity period | Three months or less |  |
Salvage value assigned to property and equipment | 0 us-gaap_PropertyPlantAndEquipmentSalvageValue |  |
Impairment charges related to long-lived assets | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Customers warranty against defects | 3 months |  |
Anti-dilutive weighted shares of potential common stock |  | 501,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 296,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Covenants Not To Compete [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible Assets Amortization Period | 3 years |  |
Customer Relationships [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible Assets Amortization Period | 8 years |  |
Building [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 30 years |  |
Property Improvements [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Minimum [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Short-term investments maturity period | Three months |  |
Estimated useful lives | 3 years |  |
Change in functional currency due to economic environment, other income | $ 2,031,000 us-gaap_TranslationAdjustmentFunctionalToReportingCurrencyNetOfTax / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Proprietary Rights [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible Assets Amortization Period | 10 years |  |
Minimum [Member] | Patents [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible Assets Amortization Period | 8 years |  |
Minimum [Member] | Channel Boxes [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Minimum [Member] | Peripheral Equipment [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 2 years |  |
Maximum [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Short-term investments maturity period | Twelve months |  |
Estimated useful lives | 7 years |  |
Maximum [Member] | Proprietary Rights [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible Assets Amortization Period | 15 years |  |
Maximum [Member] | Patents [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible Assets Amortization Period | 9 years |  |
Maximum [Member] | Channel Boxes [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 7 years |  |
Maximum [Member] | Peripheral Equipment [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Estimated useful lives | 10 years |  |

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