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
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 months
Anti-dilutive weighted shares of potential common stock		501,000	296,000
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
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