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Schedule of Unrecognized Compensation Cost and Weighted Average Period of Recognition (Detail) $ in Thousands | 9 Months Ended
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Oct. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
Unrecognized Compensation Cost | $ 34,802
Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
Unrecognized Compensation Cost | $ 821
Weighted Average Years | 7 months 6 days
Performance Stock Units (PSUs) |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
Unrecognized Compensation Cost | $ 5,660
Weighted Average Years | 1 year 10 months 24 days
Restricted Stock Units (RSUs) |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |
Unrecognized Compensation Cost | $ 28,321
Weighted Average Years | 2 years 1 month 6 days

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