Organization and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Jan. 31, 2017 USD ($)
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 [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
Maximum [Member]
Partnership Organization And Basis Of Presentation [Line Items]
Lease period	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 [Member] | Proprietary Rights Developed Technology and Amortizable Trade Names [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] | Recording Channels [Member]
Partnership Organization And Basis Of Presentation [Line Items]
Estimated useful lives	7 years
Maximum [Member] | Other Peripheral Equipment [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	3 months
Estimated useful lives	3 years
Minimum [Member] | Proprietary Rights Developed Technology and Amortizable Trade Names [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] | Recording Channels [Member]
Partnership Organization And Basis Of Presentation [Line Items]
Estimated useful lives	5 years
Minimum [Member] | Other Peripheral Equipment [Member]
Partnership Organization And Basis Of Presentation [Line Items]
Estimated useful lives	2 years