Fair Value Measurements (Narratives) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Financial Instruments Financial Assets Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, at Carrying Value	$ 1,017,398	$ 1,534,544
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]
Liabilities Fair Value Carrying Value	6,444,590	5,850,346
Carrying Value [Member]
Financial Instruments Financial Assets Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, at Carrying Value	713,900	1,173,600
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]
Liabilities Fair Value Carrying Value	$ 6,929,591	$ 6,304,038

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-4

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant