Reinsurance Recoverables and Trade Receivables, Net	12 Months Ended
Mar. 31, 2021
Reinsurance Disclosures [Abstract]
Reinsurance Recoverables and Trade Receivables, Net	Note 5. Reinsurance Recoverables and Trade Receivables, Net Reinsurance recoverables and trade receivables, net were as follows: March 31, 2021 2020 (In thousands) Reinsurance recoverable $ 66,386 $ 89,020 Trade accounts receivable 121,251 59,394 Paid losses recoverable 276 624 Accrued investment income 27,883 25,744 Premiums and agents' balances 2,546 1,582 Independent dealer receivable 258 1,015 Other receivables 10,247 9,828 228,847 187,207 Less: Allowance for doubtful accounts (4,421) (535) $ 224,426 $ 186,672

This is a combination of two separate concepts: (1) Reinsurance [Text Block]: "The entire disclosure pertaining to the existence, magnitude and information about insurance that has been ceded to or assumed from another insurance company, including the methodologies and assumptions used in determining record amounts." (2) Loans, Notes Trade and Other Receivables Disclosure [Text Block]: "The entire disclosure for claims held for amount due an entity excluding financing receivables, notes receivable, loans receivable. Includes disclosures for allowance for credit losses."

No definition available.

Name:	uhal_ReinsuranceRecoverablesAndTradeReceivablesNetTextBlock
Namespace Prefix:	uhal_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration