Real Estate and Other Activities - Disposals - 2023 Activity Additional Information (Detail) $ in Millions, $ in Millions					3 Months Ended
	Oct. 10, 2023 AUD ($) Facility	May 18, 2023 AUD ($) Facility	Mar. 29, 2023 Facility	Mar. 08, 2023 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($) Facility	Mar. 31, 2023 AUD ($) Facility
Debt Instrument [Line Items]
Number of facilities sold | Facility							3	3
Estimated Fees To Sell The Hospitals							$ 8.0
Net impairment charge					$ 500.0	$ 225.0	79.0
Straight-line rent receivable writeoffs							37.4
Estimated fees to sell the hospitals							8.0
Gains from our interest rate swap in AOCI							$ 16.0
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]							Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax
General Acute Care Facility [Member] | Australia [Member]
Debt Instrument [Line Items]
Number of facilities sold | Facility			11
Australia Transaction [Member]
Debt Instrument [Line Items]
Number of facilities sold | Facility		7
Proceeds from sale of facilities	$ 470	$ 730						$ 1,200
Number of remaining facilities sold | Facility	4	11
Prime [Member]
Debt Instrument [Line Items]
Proceeds from sale of facilities				$ 100.0
Non-cash impairment charge							$ 11.0