Income Taxes - Summary of Income before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Results Of Operations Income Before Income Taxes [Abstract]
U.S. operations	$ 1,381	$ 2,683	$ 3,092
Non-U.S. operations	(35,933)	23,046	57,789
Income (loss) before income taxes	$ (34,552)	$ 25,729	$ 60,881

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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