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Other Noncurrent Liabilities and Redeemable/Noncontrolling Interests - Additional Information (Detail) $ in Millions | Sep. 30, 2025 USD ($) Facility | Mar. 31, 2025 USD ($)
--- | --- | ---
Minority Interest [Line Items] |  |
Non-controlling interest balances | $ 61 |
Redeemable non-controlling interest balances | $ 67 |
Redeemable noncontrolling interest |  | $ 39
Michigan |  |
Minority Interest [Line Items] |  |
Behavioral health care facilities with outside owners holding non-controlling minority interest | Facility | 2 |
Outside Owners | Acute Care Facility | Texas |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 7.00% |
Outside Owners | Acute Care Facility | Nevada |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 5.00% |
Outside Owners | Behavioral Health Care Facility | Arizona |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 49.00% |
Outside Owners | Behavioral Health Care Facility | Ohio |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 30.00% |
Outside Owners | Behavioral Health Care Facility | Washington |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 20.00% |
Outside Owners | Behavioral Health Care Facility | Missouri |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 25.00% |
Outside Owners | Behavioral Health Care Facility | Iowa |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 48.00% |
Outside Owners | Behavioral Health Care Facility One | Michigan |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 25.00% |
Outside Owners | Behavioral Health Care Facility Two | Michigan |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 49.00% |
Outside Owners | Surgery center | Nevada |  |
Minority Interest [Line Items] |  |
Percentage of non-controlling, minority ownership interests held by outside owners | 49.00% |
Hospital | Behavioral Health Care Facility | Pennsylvania |  |
Minority Interest [Line Items] |  |
Non-controlling ownership interests by subsidiaries | 20.00% |

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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479887/480-10-S45-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3A -Subparagraph (24) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (01)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480244/480-10-S99-1 + Details
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