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Shareholders' Equity (Share Repurchase Program) (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Share Repurchase Program [Line Items]
Number of shares repurchased (in shares)	6,700
Aggregate cost of shares repurchased	$ 588,028	$ 523,751	$ 418,346
2023 Share Repurchase Program
Share Repurchase Program [Line Items]
Number of shares repurchased (in shares)	6,679	4,459	0
Aggregate cost of shares repurchased	$ 588,028	$ 364,639	$ 0
Shares repurchased for cancellation (in shares)		4,100
Shares repurchased for cancellation		$ 332,100
Aggregate cost of shares repurchased but not yet paid	$ 18,700	$ 19,500
2020 Share Repurchase Program
Share Repurchase Program [Line Items]
Number of shares repurchased (in shares)	0	2,641	7,562
Aggregate cost of shares repurchased	$ 0	$ 159,112	$ 418,346

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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