Number of peer companies for ranking in TSR Comparison.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The policy, if any, for issuing shares (or other type of equity) upon exercise or conversion of equity-based awards into shares of stock or units, including the source of those shares or units (that is, new share, new unit, treasury shares or treasury units).

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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Stock Award Plans and Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended				12 Months Ended
	Nov. 30, 2020 shares	May 31, 2020 peercompany shares	May 31, 2019 shares	May 31, 2018 shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised in period \| $					$ 54,900	$ 15,000	$ 174,000
Proceeds from the exercise of stock options \| $					$ 9,075	$ 3,748	$ 12,949
Expected dividend yield					0.00%
Restricted share unit issued					30,881,000
2015 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option conversion description					Each share of stock issued pursuant to a stock option or stock appreciation right counts as one share against the maximum number of shares issuable under the 2015 Plan, while each share of stock issued pursuant to any other type of award counts as 1.8 shares against the maximum number of shares issuable under the 2015 Plan.
Shares available for future issuance under the Plan					3,334,890
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award plans, outstanding stock options expiration period					10 years
Vesting period					3 years
Unrecognized stock-based compensation expense \| $					$ 8,900
Unrecognized stock-based compensation expense, weighted-average recognition period					1 year 7 months 6 days
Expected dividend yield					0.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					3 years
Unrecognized stock-based compensation expense \| $					$ 51,900
Unrecognized stock-based compensation expense, weighted-average recognition period					1 year 9 months 18 days
Weighted average grant-date fair value \| $ / shares					$ 254.78	$ 258.59	$ 376.95
Fair value of units vested \| $					$ 27,900	$ 99,300	$ 171,300
Restricted share unit issued					230,000
Non-vested shares, outstanding					301,000	320,000
Performance and Market-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense \| $					$ 24,200
Unrecognized stock-based compensation expense, weighted-average recognition period					1 year 9 months 18 days
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share unit issued			196,580	114,000
Performance Based Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share unit issued	66,000
Performance Based Restricted Stock Units Issued in May 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares, outstanding					22,000
Performance Based Restricted Stock Units Issued in May 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share unit issued		62,000
Performance Based Restricted Stock Units Issued in May 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares, outstanding						0
Market-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share unit issued		61,762
Stock units minimum range percent		0.00%
Stock units maximum range percent		200.00%
Number of peer companies for ranking in TSR Comparison \| peercompany		20
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP, exercise price as a percentage of its market price					85.00%