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Income Taxes (Income (Loss) Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Swiss	$ 492,941	$ 502,291	$ 282,970
Non-Swiss	213,931	119,305	180,552
Income before income taxes	$ 706,872	$ 621,596	$ 463,522

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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