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Net Income (Loss) Per Ordinary Share - Computation of Basic and Diluted Net Income (Loss) Per Ordinary Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Numerator:
Net income (loss)	$ (10,006)	$ 2,564
Denominator:
Weighted-average ordinary shares - basic	33,334,801	33,253,817
Effect of potentially dilutive securities:
Employee stock options	0	1,006,149
Restricted stock and restricted stock units	0	422,744
Employee stock purchase plan	0	2,371
Weighted-average ordinary shares - diluted	33,334,801	34,685,081
Net income (loss) per ordinary share:
Basic	$ (0.30)	$ 0.08
Diluted	$ (0.30)	$ 0.07

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