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Employee Stock Plans - Compensation Cost Not Yet Recognized (Details)	6 Months Ended
	Jul. 31, 2024 USD ($)
Stock Options
Share-Based Payment Arrangement [Abstract]
Weighted-average remaining recognition period (years)	1 year 4 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs (in thousands)	$ 18,608
Weighted-average remaining recognition period (years)	1 year 4 months 6 days
RSUs
Share-Based Payment Arrangement [Abstract]
Unrecognized compensation costs (in thousands)	$ 201,739
Weighted-average remaining recognition period (years)	2 years 8 months 4 days
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs (in thousands)	$ 201,739
Weighted-average remaining recognition period (years)	2 years 8 months 4 days

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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