Reconciliation of Beginning and Ending Balances of Total Amounts of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Reconciliation Of Income Taxes [Line Items]
Balance at the beginning of the period	$ 7,838	$ 6,889	$ 4,835
Increases in tax positions for prior years	21	4,053	2,518
Decreases in tax positions for prior years	(725)	(891)	(12)
Increases in tax positions for current year	187	274	352
Settlements	(590)	(1,590)	(620)
Lapse in statute of limitations	(933)	(897)	(184)
Balance at the end of the period	$ 5,798	$ 7,838	$ 6,889

Reconciliation Of Income Taxes [Line Items]

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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- Definition

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

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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