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Revenue Recognition - Impacts of Adopting New Revenue Standard on Condensed Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue	$ 56,938	$ 64,135
Cost of revenue	22,046	23,172
Gross profit	34,892	40,963
Loss from operations	(9,950)	2,617
Loss before income taxes	(9,158)	2,770
Provision for income taxes	848	206
Net loss	$ (10,006)	$ 2,564
Net loss per share:
Basic	$ (0.30)	$ 0.08
Diluted	$ (0.30)	$ 0.07
Topic 606 [Member] | Impact of Adoption [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue	$ (4,915)
Cost of revenue	(1,600)
Gross profit	(3,315)
Loss from operations	(3,315)
Loss before income taxes	(3,315)
Provision for income taxes	197
Net loss	$ (3,512)
Net loss per share:
Basic	$ (0.11)
Diluted	$ (0.11)
Topic 606 [Member] | Amounts under ASC 605 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue	$ 52,023
Cost of revenue	20,446
Gross profit	31,577
Loss from operations	(13,265)
Loss before income taxes	(12,473)
Provision for income taxes	1,045
Net loss	$ (13,518)
Net loss per share:
Basic	$ (0.41)
Diluted	$ (0.41)

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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