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Schedule of Unrecognized Compensation Cost and Weighted Average Period of Recognition (Detail) $ in Thousands | 6 Months Ended
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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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