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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, 2019	Jan. 31, 2018	Jan. 31, 2017
Income Tax Disclosure [Abstract]
Balance at the beginning of the period	$ 4,546	$ 5,798	$ 7,838
Increases in tax positions for prior years	18,077	45	21
Decreases in tax positions for prior years	(921)	(511)	(725)
Increases in tax positions for current year	196	128	187
Settlements			(590)
Lapse in statute of limitations	(492)	(914)	(933)
Balance at the end of the period	$ 21,406	$ 4,546	$ 5,798

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