Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Jun. 25, 2015
Finite Lived Intangible Assets [Line Items]
Committed to make license payment through January 2020			$ 13,700,000
Noncancelable software license, amortization expense	$ 900,000		2,000,000
Impairment of intangible assets	0	$ 0	0	$ 0
Accrued and other current liabilities [Member]
Finite Lived Intangible Assets [Line Items]
Liabilities associated with noncancelable internal-use software license at net present value, current	4,300,000		4,300,000
Other long-term liabilities [Member]
Finite Lived Intangible Assets [Line Items]
Liabilities associated with noncancelable internal-use software license at net present value, non-current	6,300,000		6,300,000
Vis Lab SRL [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets acquired					$ 4,100,000
IPR&D [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible asset	0		0
IPR&D [Member] | Vis Lab SRL [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets acquired					$ 4,100,000
Noncancelable software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets	$ 11,100,000		$ 11,100,000