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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
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 |  |
Contracts receivable term | Less than two years |  |
Liquid investments maturity period | Three months or less |  |
Salvage value assigned to property and equipment | 0 |  |
Impairment charges related to long-lived assets | 0 | 0 | 0
Customers warranty against defects | 3 years |  |
Warranty expense amounted to approximately | $ 0 | $ 61,000 | $ 3,000
Anti-dilutive weighted shares of potential common stock | 501,000 | 296,000 | 339,000
Covenants Not To Compete [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible Assets Amortization Period | 3 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 |  |
Minimum [Member] | Proprietary Rights [Member] |  |  |
Partnership Organization And Basis Of Presentation [Line Items] |  |  |
Intangible Assets Amortization Period | 12 years 6 months |  |
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] | 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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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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