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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, 2018	Jan. 31, 2017	Jan. 31, 2016
Income Tax Disclosure [Abstract]
Balance at the beginning of the period	$ 5,798	$ 7,838	$ 6,889
Increases in tax positions for prior years	45	21	4,053
Decreases in tax positions for prior years	(511)	(725)	(891)
Increases in tax positions for current year	128	187	274
Settlements		(590)	(1,590)
Lapse in statute of limitations	(914)	(933)	(897)
Balance at the end of the period	$ 4,546	$ 5,798	$ 7,838

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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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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