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Schedule of Unrecognized Compensation Cost and Weighted Average Period of Recognition (Detail) $ in Thousands	3 Months Ended
	Apr. 30, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unrecognized Compensation Cost	$ 59,009
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unrecognized Compensation Cost	$ 9,563
Weighted Average Years	2 years 9 months 18 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unrecognized Compensation Cost	$ 49,446
Weighted Average Years	2 years 6 months

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+ References

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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=120381028&loc=d3e5070-113901

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