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Schedule of Unrecognized Compensation Cost and Weighted Average Period of Recognition (Detail) $ in Thousands	6 Months Ended
	Jul. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unrecognized Compensation Cost	$ 41,401
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unrecognized Compensation Cost	$ 1,171
Weighted Average Years	9 months 18 days
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unrecognized Compensation Cost	$ 6,794
Weighted Average Years	2 years 1 month 6 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unrecognized Compensation Cost	$ 33,436
Weighted Average Years	2 years 3 months 18 days

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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