Marketable Securities - Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Available-for-sale securities, Amortized cost, Matures in less than five years	$ 953,150	$ 956,797
Available-for-sale securities, Amortized cost, Matures in more than five years	7,312	2,990
Available-for-sale securities, Amortized Cost	960,462	959,787
Investment at fair value through Profit & Loss	11,649	10,475
Debt and Equity Securities, Amortized Cost	972,111	970,262
Available-for-sale securities, Market Value, Matures in less than five years	940,212	962,103
Available-for-sale securities, Market Value, Matures in more than five years	6,971	3,033
Available-for-sale marketable securities, Market Value	947,183	965,136
Investment at fair value through Profit & Loss	10,034	10,553
Marketable securities	$ 957,217	$ 975,689

Debt and equity securities amortized cost basis.

No definition available.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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- Definition

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of investment in marketable security.

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