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Fair Value Measurements (Narratives) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
Financial Instruments Financial Assets Balance Sheet Groupings [Abstract]
Cash and Cash Equivalent	$ 1,082,820	$ 988,828
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]
Liabilities Fair Value Carrying Value	9,662,415	9,140,047
Level 3 [Member]
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]
Liabilities Fair Value Carrying Value	2,461,369	2,436,537
Carrying Value [Member]
Financial Instruments Financial Assets Balance Sheet Groupings [Abstract]
Cash and Cash Equivalent	786,700	700,000
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]
Liabilities Fair Value Carrying Value	$ 10,242,515	$ 9,732,070

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- Definition

Fair value of financial and nonfinancial obligations, carrying value.

+ References

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- Definition

Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

+ References

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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