Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Plans

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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No definition available.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Stockholders' Equity - Narrative (Details) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2023 USD ($) plan $ / shares shares	Oct. 31, 2022 USD ($) $ / shares shares	Oct. 31, 2023 USD ($) plan $ / shares shares	Oct. 31, 2022 USD ($) $ / shares shares	Sep. 30, 2023 USD ($)	Mar. 31, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans \| plan	3		3
Unrecognized compensation cost, options	$ 0		$ 0
Employee stock purchase plan, compensation expense			$ 455,831,000	$ 392,765,000
Stock repurchase program, authorized amount					$ 300,000,000	$ 200,000,000
Repurchases of common stock (in shares) \| shares	1.8	0.7	3.1	1.1
Average price per share of stock repurchased (in usd per share) \| $ / shares	$ 42.48	$ 51.28	$ 47.57	$ 55.52
Aggregate purchase price of stock repurchased	$ 75,035,000	$ 38,034,000	$ 145,515,000	$ 63,041,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, RSUs	1,300,000,000		$ 1,300,000,000
Unrecognized compensation cost, remaining weighted-average period for recognition			3 years 2 months 12 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan, compensation expense	4,200,000	$ 5,400,000	$ 12,800,000	$ 17,300,000
Market Based And Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of unvested RSU's	$ 117,900,000		$ 117,900,000
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance (in shares) \| shares	35.7		35.7
2018 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance (in shares) \| shares	10.6		10.6