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Reconciliation of Beginning and Ending Balances of Total Amounts of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Balance at the beginning of the period	$ 21,406	$ 4,546	$ 5,798
Increases in tax positions for prior years	661	18,077	45
Decreases in tax positions for prior years	(101)	(921)	(511)
Increases in tax positions for current year	125	196	128
Lapse in statute of limitations	(167)	(492)	(914)
Balance at the end of the period	$ 21,924	$ 21,406	$ 4,546

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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